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71440970 - View of the crystal clear reflections of the mountains and trees on tranquil Lake Tioga in the pass of the same name, California, USA

Fascinating structures and cavities in the marble of the Capillas de Marmol in the clear waters of Lago General Carrera in Southern Chile, Patagonia

71438016 - Fascinating structures and cavities in the marble of the Capillas de Marmol in the clear waters of Lago General Carrera in Southern Chile, Patagonia

71432576 - Double exposure of a orange residential building against a clear blue sky in Tartu, Estonia.

The Milky Way and galactic core area over Mount Andromeda (centre), Mount Athabasca (left) and the Athabasca Glacier (right) at the Columbia Icefields, on a very clear night July 27, 2020.

13899634 - The Milky Way and galactic core area over Mount Andromeda (centre), Mount Athabasca (left) and the Athabasca Glacier (right) at the Columbia Icefields, on a very clear night July 27, 2020.

A selfie of me with the Celestron C8 telescope, with an aurora in the north, for a book illustration. Taken July 21, 2019 from the backyard on a very clear night just at moonrise.

13899626 - A selfie of me with the Celestron C8 telescope, with an aurora in the north, for a book illustration. Taken July 21, 2019 from the backyard on a very clear night just at moonrise.

The stars setting into the west over the Columbia Icefields and Athasbasca (left) and Stutfield (right) glaciers, and Snowdome peak. I shot this Sept 6 under very clear skies and a bright waxing gibbous Moon off frame at left. I shot this from the moraine at the upper parking lot.

13899184 - The stars setting into the west over the Columbia Icefields and Athasbasca (left) and Stutfield (right) glaciers, and Snowdome peak. I shot this Sept 6 under very clear skies and a bright waxing gibbous Moon off frame at left. I shot this from the moraine at the upper parking lot.

The stars of Ursa Major, the Great Bear, over the waters of Peyto Lake, Banff, in deep twilight. Arcturus in Böotes, the Bear Driver, is setting over the peak at left. Ursa Major contains the seven stars that make up the Big Dipper, aka the Plough or the Wagon. This was October 13, 2022 on a very clear night in the Rocky Mountains.

13898308 - The stars of Ursa Major, the Great Bear, over the waters of Peyto Lake, Banff, in deep twilight. Arcturus in Böotes, the Bear Driver, is setting over the peak at left. Ursa Major contains the seven stars that make up the Big Dipper, aka the Plough or the Wagon. This was October 13, 2022 on a very clear night in the Rocky Mountains.

$The partial eclipse of the Sun, October 23, 2014, as seen from Jasper, Alberta, shot under clear skies through a mylar filter, on the front of a 66mm f/6 apo refractor using the Canon 60Da for 1/8000 (!) sec exposure at ISO 100. The colours are natural, with the mylar filter providing a neutral “white light” image. The big sunspot on the Sun that day is just disappearing behind the Moon’s limb. The mylar filter gave a white Sun, its natural colour, but I have tinted the Sun’s disk yellow for a more pleasing view that is not just white Sun/black sky.$

13897388 - The partial eclipse of the Sun, October 23, 2014, as seen from Jasper, Alberta, shot under clear skies through a mylar filter, on the front of a 66mm f/6 apo refractor using the Canon 60Da for 1/8000 (!) sec exposure at ISO 100. The colours are natural, with the mylar filter providing a neutral “white light” image. The big sunspot on the Sun that day is just disappearing behind the Moon’s limb. The mylar filter gave a white Sun, its natural colour, but I have tinted the Sun’s disk yellow for a more pleasing view that is not just white Sun/black sky.

Photo of boats on the crystal clear Adriatic Sea, Hvar Island, Adriatic Coast, Dalmatia (Dalmacija), Croatia. This is a photo of boats on the crystal clear Adriatic Sea that surrounds Hvar Island on the Adriatic Coast of Croatia.

13849263 - Photo of boats on the crystal clear Adriatic Sea, Hvar Island, Adriatic Coast, Dalmatia (Dalmacija), Croatia. This is a photo of boats on the crystal clear Adriatic Sea that surrounds Hvar Island on the Adriatic Coast of Croatia.

Tour guide on a Elaphiti Islands one day tour, feeding seagulls, Elaphiti Islands, Croatia. This photo shows a tour guide on a one day tour of Elaphiti Islands, feeding the seagulls. The Elaphiti Islands are a small archipelago situated just a short boat crossing from Dubrovnik on the Dalmatian Coast of Croatia. For their quiet, rustic villages, quaint cathedrals and the inviting, blue, crystal clear Adriatic Sea, visiting Sipan (Sipano), Kolocep (Kalamota) and Lopud Island, the three main islands in the Elaphiti Islands makes for a fantastic day trip from Dubrovnik.

13848553 - Tour guide on a Elaphiti Islands one day tour, feeding seagulls, Elaphiti Islands, Croatia. This photo shows a tour guide on a one day tour of Elaphiti Islands, feeding the seagulls. The Elaphiti Islands are a small archipelago situated just a short boat crossing from Dubrovnik on the Dalmatian Coast of Croatia. For their quiet, rustic villages, quaint cathedrals and the inviting, blue, crystal clear Adriatic Sea, visiting Sipan (Sipano), Kolocep (Kalamota) and Lopud Island, the three main islands in the Elaphiti Islands makes for a fantastic day trip from Dubrovnik.

13848069 - Row boats at Clear Lake Resort dock, Cascade Mountains, Oregon.

Family on summer vacation snorkeling in the crystal clear blue Pacific ocean on the tropical island of Rarotonga, Cook Islands, background with copy space

13846117 - Family on summer vacation snorkeling in the crystal clear blue Pacific ocean on the tropical island of Rarotonga, Cook Islands, background with copy space

Tropical Island of Rarotonga seen from the beautiful crystal clear Pacific Ocean at Muri Lagoon, Rarotonga, Cook Islands, background with copy space

13846024 - Tropical Island of Rarotonga seen from the beautiful crystal clear Pacific Ocean at Muri Lagoon, Rarotonga, Cook Islands, background with copy space

A white-tailed, or yellow-billed tropicbird, Phaethon lepturus, in flight over clear blue water. Fregate Island, Republic of the Seychelles.

13837231 - A white-tailed, or yellow-billed tropicbird, Phaethon lepturus, in flight over clear blue water. Fregate Island, Republic of the Seychelles.

13820766 - Clear ice wind blasted pressure ridge at sunset on Lake Manitoba near Limestone Point Manitoba Canada

Polar Bear (ursus maritimus) swimming in crystal clear blue sub-arctic water in Wager Bay Nunavut near Hudson Bay, Churchill area, Manitoba, Northern Canada

13820715 - Polar Bear (ursus maritimus) swimming in crystal clear blue sub-arctic water in Wager Bay Nunavut near Hudson Bay, Churchill area, Manitoba, Northern Canada

13820714 - Polar Bear (ursus maritimus) swimming in crystal clear blue sub-arctic water in Wager Bay Nunavut near Hudson Bay, Churchill area, Manitoba, Northern Canada

13760857 - Snow-covered mountain house with fir trees under a clear winter sky

The Milky Way over Athabasca Glacier and the Columbia Icefields in Jasper National Park, Sept 14, 2014 on a very clear night before moonrise. The centre of the Galaxy area in Sagittarius is setting in the southwest behind the Icefields. The foreground light on the moraines is wash from lights on the Glacier View Inn and Icefields Centre. Other ground illumination on the peaks is from starlight though the tops of the peaks are just being lit by light from the rising waning Moon which is also beginning to light the sky a deep blue. Mt. Andromeda is at left. The Summer Triangle stars are at centr

13899985 - The Milky Way over Athabasca Glacier and the Columbia Icefields in Jasper National Park, Sept 14, 2014 on a very clear night before moonrise. The centre of the Galaxy area in Sagittarius is setting in the southwest behind the Icefields. The foreground light on the moraines is wash from lights on the Glacier View Inn and Icefields Centre. Other ground illumination on the peaks is from starlight though the tops of the peaks are just being lit by light from the rising waning Moon which is also beginning to light the sky a deep blue. Mt. Andromeda is at left. The Summer Triangle stars are at centr

Circumpolar star trails on a moonlit night in the Gila National Forest in southern New Mexico, north of Pinos Altos. Polaris is at upper left, the Little Dipper hanging below it, and the stars of the Big Dipper are rising at right, with the end star of the handle still to clear the horizon. Illumination is from the waxing quarter Moon. The night had a lot of high cloud drifting through, adding the streaks and patchiness to the sky.

13898793 - Circumpolar star trails on a moonlit night in the Gila National Forest in southern New Mexico, north of Pinos Altos. Polaris is at upper left, the Little Dipper hanging below it, and the stars of the Big Dipper are rising at right, with the end star of the handle still to clear the horizon. Illumination is from the waxing quarter Moon. The night had a lot of high cloud drifting through, adding the streaks and patchiness to the sky.

A 360° panorama of Bow Lake in Banff National Park, Alberta on a very dark and clear night, July 17, 2018. The Milky Way toward the galactic core lies above Bow Glacier at right. Saturn is reflected in the still waters.

13898634 - A 360° panorama of Bow Lake in Banff National Park, Alberta on a very dark and clear night, July 17, 2018. The Milky Way toward the galactic core lies above Bow Glacier at right. Saturn is reflected in the still waters.

A selfie of me operating the Celestron C8 GoTo system to find targets, for a book illustration. Taken July 21, 2019 from the backyard on a very clear night just before moonrise.,

13898275 - A selfie of me operating the Celestron C8 GoTo system to find targets, for a book illustration. Taken July 21, 2019 from the backyard on a very clear night just before moonrise.,

The summer Milky Way on a clear moonless September evening, from my rural backyard in southern Alberta. This is a stack of 5 x 5 minute exposures with the 15mm f/2.8 lens and Canon 5D MkII at ISO 800, on the iOptron SkyTracker. Portrait version.

13897607 - The summer Milky Way on a clear moonless September evening, from my rural backyard in southern Alberta. This is a stack of 5 x 5 minute exposures with the 15mm f/2.8 lens and Canon 5D MkII at ISO 800, on the iOptron SkyTracker. Portrait version.

This is a panorama of Peyto Lake in Banff National Park, on the Icefields Parkway in Alberta, taken at moonrise on a very clear and mild mid-October evening. The glacier-fed lake appears its characteristic blue even when lit by starlight. It is not blended in from an earlier "blue hour" shot.

13897570 - This is a panorama of Peyto Lake in Banff National Park, on the Icefields Parkway in Alberta, taken at moonrise on a very clear and mild mid-October evening. The glacier-fed lake appears its characteristic blue even when lit by starlight. It is not blended in from an earlier "blue hour" shot.

The rising of the Full "Hunter's Moon" of October 9, 2022, with the Moon reflected in the calm waters this night at Crawling Lake Reservoir in southern Alberta. The Moon appeared very pink as it rose into the clear sky near the horizo, then turned more yellow as it rose into scattered bands of cloud.

13897375 - The rising of the Full "Hunter's Moon" of October 9, 2022, with the Moon reflected in the calm waters this night at Crawling Lake Reservoir in southern Alberta. The Moon appeared very pink as it rose into the clear sky near the horizo, then turned more yellow as it rose into scattered bands of cloud.

13876625 - Low Angle View Of Palm Trees Against Clear Blue Sky

A healthy tropical coral reef hosting tabletop and staghorn corals and encrusting, colorful sponges with clear blue water. Malolo Island Resort and Likuliku Resort, Mamanucas island group Fiji

13846947 - A healthy tropical coral reef hosting tabletop and staghorn corals and encrusting, colorful sponges with clear blue water. Malolo Island Resort and Likuliku Resort, Mamanucas island group Fiji

13845948 - Snorkeling in the crystal clear blue Pacific ocean on the tropical island of Rarotonga, Cook Islands, background with copy space

A sandy tropical beach with large boulders and a clear blue sky overhead. Anse Source d'Argent Beach, La Digue Island, The Republic of the Seychelles.

13837203 - A sandy tropical beach with large boulders and a clear blue sky overhead. Anse Source d'Argent Beach, La Digue Island, The Republic of the Seychelles.

13792828 - Woman At The Beach Standing In Clear Water.

13790445 - Traditional Windmill Against Clear Sky

71447242 - Temple of the Holy Cross Tower Against Blue Clear Sky in a Sunny Day in Riva San Vitale, Ticino, Switzerland.

71440601 - clear water at Koenigssee, Schönau am Koenigssee, Berchtesgaden National Park, Bavaria, Germany, Europe

71433466 - Autumnal view of colorful forest leaves on a clear blue sky background in Bruges, Belgium.

71429461 - Idyllic landscape with trees and rock formations under a clear sky, Bryce Canyon, Utah, United States

A close passage of Venus by the Pleiades star cluster (M45) on April 9,2023. Venus was closer to the Pleiades the next night,but clouds prevented a shot on April 10. But the night before closest approach was clear enough for long enough to get this shot of the bright planet and stars set in the deep blue twilight.

13999322 - A close passage of Venus by the Pleiades star cluster (M45) on April 9,2023. Venus was closer to the Pleiades the next night,but clouds prevented a shot on April 10. But the night before closest approach was clear enough for long enough to get this shot of the bright planet and stars set in the deep blue twilight.

Orion and Sirius over the moonlit badlands of Dinosaur Provincial Park,Alberta on Feb. 4,2023 with the waxing gibbous Moon providing the illumination on this very clear and mild night.

13998770 - Orion and Sirius over the moonlit badlands of Dinosaur Provincial Park,Alberta on Feb. 4,2023 with the waxing gibbous Moon providing the illumination on this very clear and mild night.

$An iceberg of clear ice floats at the terminus of the San Rafael Glacier in Laguna San Rafael National Park, Chile.\n$

13924825 - An iceberg of clear ice floats at the terminus of the San Rafael Glacier in Laguna San Rafael National Park, Chile.\n

The stars of the Big Dipper over the iconic peak of Pyramid Mountain from Pyramid Island, a popular location in Jasper National Park, Alberta, for nightscape and aurora photography. This was on a very clear night in mid-October, 2022, with many aspen stands still in full autumn colour. The images for this scene were shot at moonrise, with the waning gibbous Moon off frame at right lighting the sky blue and landscape with warm alpenglow moonlight. As bonus, a short bright meteor and its orange "smoke" trail appeared on the sky exposures. I shot this during the first weekend of the 2022 Jasper D

13900261 - The stars of the Big Dipper over the iconic peak of Pyramid Mountain from Pyramid Island, a popular location in Jasper National Park, Alberta, for nightscape and aurora photography. This was on a very clear night in mid-October, 2022, with many aspen stands still in full autumn colour. The images for this scene were shot at moonrise, with the waning gibbous Moon off frame at right lighting the sky blue and landscape with warm alpenglow moonlight. As bonus, a short bright meteor and its orange "smoke" trail appeared on the sky exposures. I shot this during the first weekend of the 2022 Jasper D

$The partial solar eclipse as seen from Calgary, Alberta, on May 20, 2012, but seen as an annular eclipse from the SW United States. This was taken at maximum eclipse at 7:14 pm MDT, with 62% of the Sun covered. Taken from the TELUS Spark science centre at a public event there, and taken with an 80mm A&M apo refractor at f/6 (480mm focal length) and Canon 60Da camera at ISO 100 and 1/250 second exposure through a Baader solar filter. The Sun was in high cloud and not in a clear blue sky.$

13900115 - The partial solar eclipse as seen from Calgary, Alberta, on May 20, 2012, but seen as an annular eclipse from the SW United States. This was taken at maximum eclipse at 7:14 pm MDT, with 62% of the Sun covered. Taken from the TELUS Spark science centre at a public event there, and taken with an 80mm A&M apo refractor at f/6 (480mm focal length) and Canon 60Da camera at ISO 100 and 1/250 second exposure through a Baader solar filter. The Sun was in high cloud and not in a clear blue sky.

13899826 - A scene at the Nova East Star Party near Windsor, Nova Scotia, in August 2015, showing laser pointer in use under a clear starry sky.

A composite of the November 11, 2019 Transit of Mercury across the disk of the Sun, on a day with no sunspots on the Sun. The temperature was about -20° C to -15° C this morning but the sky was perfectly clear.

13899770 - A composite of the November 11, 2019 Transit of Mercury across the disk of the Sun, on a day with no sunspots on the Sun. The temperature was about -20° C to -15° C this morning but the sky was perfectly clear.

A vertical panorama of the summer Milky Way over the observing field at the Saskatchewan Summer Star Party, held in Cypress Hills Interprovincial Park in southwest Saskatchewan, Canada, at a latitude 49° N. The Park is a Dark Sky Preserve. This was August 26, 2022 on a perfect night of stargazing under very clear skies. The Milky Way extends from Sagittarius near the horizon, to Cygnus nearly overhead at this time, so a vertical sweep of 90°. I've left the satellite trails in for this scene.

13899639 - A vertical panorama of the summer Milky Way over the observing field at the Saskatchewan Summer Star Party, held in Cypress Hills Interprovincial Park in southwest Saskatchewan, Canada, at a latitude 49° N. The Park is a Dark Sky Preserve. This was August 26, 2022 on a perfect night of stargazing under very clear skies. The Milky Way extends from Sagittarius near the horizon, to Cygnus nearly overhead at this time, so a vertical sweep of 90°. I've left the satellite trails in for this scene.

The constellation of Ursa Major, the Great Bear, and the asterism of the Big Dipper low in the north over Lake Edith in Jasper National Park, on a clear autumn night. Arcturus is at left setting over Pyramid Mountain.

13898535 - The constellation of Ursa Major, the Great Bear, and the asterism of the Big Dipper low in the north over Lake Edith in Jasper National Park, on a clear autumn night. Arcturus is at left setting over Pyramid Mountain.

13898425 - The rising of the Full "Hunter's Moon" of October 9, 2022, with the Moon reflected in the calm waters this night at Crawling Lake Reservoir in southern Alberta. The Moon appeared very pink as it rose into the clear sky near the horizon.

$The Full Moon rising on December 22, 2018, the day after the winter solstice, in a perfectly clear sky and over the distant horizon to the northeast over the snow-covered prairie. Some cows are grazing at left! The top edge of the Moon has a green rim and the bottom edge a red rim, from atmospheric refraction. But it made for a Christmas-coloured Moon ornament on the horizon! The dark lunar mare and even the bright rays splashing from Tycho at bottom are visible.$

13898326 - The Full Moon rising on December 22, 2018, the day after the winter solstice, in a perfectly clear sky and over the distant horizon to the northeast over the snow-covered prairie. Some cows are grazing at left! The top edge of the Moon has a green rim and the bottom edge a red rim, from atmospheric refraction. But it made for a Christmas-coloured Moon ornament on the horizon! The dark lunar mare and even the bright rays splashing from Tycho at bottom are visible.

$The partial eclipse of the Sun, October 23, 2014, as seen from Jasper, Alberta, in this case shot through thin cloud but that makes for a more interesting photo than one in a clear sky. This is still shot through a mylar filter, on the front of a 66mm f/6 apo refractor using the Canon 60Da for 1/25 sec exposure at ISO 100. The colours are natural, with the mylar filter providing a neutral “white light” image. With the Sun dimmed a lot by cloud, the longer exposure allowed picking up light and colours in the surrounding clouds.$

13897553 - The partial eclipse of the Sun, October 23, 2014, as seen from Jasper, Alberta, in this case shot through thin cloud but that makes for a more interesting photo than one in a clear sky. This is still shot through a mylar filter, on the front of a 66mm f/6 apo refractor using the Canon 60Da for 1/25 sec exposure at ISO 100. The colours are natural, with the mylar filter providing a neutral “white light” image. With the Sun dimmed a lot by cloud, the longer exposure allowed picking up light and colours in the surrounding clouds.

Tourist boat trip on a summer vacation to the tropical island of Rarotonga in the perfect crystal clear blue water of Muri Lagoon, Pacific Ocean

13844587 - Tourist boat trip on a summer vacation to the tropical island of Rarotonga in the perfect crystal clear blue water of Muri Lagoon, Pacific Ocean

Grey Seal (Halichoerus grypus) against a background of clear waters, sky and barnacle covered rocks. Farne Islands, Northumberland, England.

13829472 - Grey Seal (Halichoerus grypus) against a background of clear waters, sky and barnacle covered rocks. Farne Islands, Northumberland, England.

above; aerial; aerial view; architecture; attraction; austria; balcony; beautiful; bell; belltower; blue; brick; building; castle; city; cityscape; clear; clock; clocks; clocktower; day; daylight; daytime; destination; downtown; europe; european; exterior; exteriors; famous; fortification; fortress; graz; green; heritage; hill; historic; historical; house; landmark; main; medieval; monument; mountain; old; outdoor; outdoors; overview; panorama; panoramic; park; people; platz; red; roof; roofs; rooftops; schlossberg; sightseeing; sky; skyline; square; streetcar; styria; summer; sunny; symbol; t

13823472 - above; aerial; aerial view; architecture; attraction; austria; balcony; beautiful; bell; belltower; blue; brick; building; castle; city; cityscape; clear; clock; clocks; clocktower; day; daylight; daytime; destination; downtown; europe; european; exterior; exteriors; famous; fortification; fortress; graz; green; heritage; hill; historic; historical; house; landmark; main; medieval; monument; mountain; old; outdoor; outdoors; overview; panorama; panoramic; park; people; platz; red; roof; roofs; rooftops; schlossberg; sightseeing; sky; skyline; square; streetcar; styria; summer; sunny; symbol; t

13792584 - View To The Pagoda At Kiyomizudera (Clear Water Spring Temple).

13792298 - Hawa Mahal, Palace Of Winds Facade Against Clear Sky, Close-Up

71447244 - Beautiful Panoramic View over a Village in Italy on Mountain and Valley with Sunlight and Clear Blue Sky in Lombardy, Italy.

The mesmerizing Capilla de Marmol in the clear waters of Lago General Carrera near Puerto Rio Tranquilo, Chile, Patagonia, South America

71438014 - The mesmerizing Capilla de Marmol in the clear waters of Lago General Carrera near Puerto Rio Tranquilo, Chile, Patagonia, South America

Aerial view of a sailing catamaran in clear turquoise waters with islands behind, St Anne Marine National Park, near Mahé Island, Seychelles, Indian Ocean

71429304 - Aerial view of a sailing catamaran in clear turquoise waters with islands behind, St Anne Marine National Park, near Mahé Island, Seychelles, Indian Ocean

The arcs and wisps of the Veil Nebula supernova remnant in Cygnus,framed with the open star cluster NGC 6940 in Vulpecula at lower right. The area is marked by a sharp transition between clear starry sky in the Millky Way and brownish-yellow areas obscured by interstellar dust with fewer stars visible. The nebula colours show up well despite this being a "stock" camera,with no filters employed.

13999660 - The arcs and wisps of the Veil Nebula supernova remnant in Cygnus,framed with the open star cluster NGC 6940 in Vulpecula at lower right. The area is marked by a sharp transition between clear starry sky in the Millky Way and brownish-yellow areas obscured by interstellar dust with fewer stars visible. The nebula colours show up well despite this being a "stock" camera,with no filters employed.

The sparkling winter stars and constellations over the moonlit badlands of Dinosaur Provincial Park,Alberta on Feb. 4,2023. The waxing gibbous Moon is off frame at left providing the illumination on this very clear and mild night. Captured here in a vertical panorama from below the horizon to past the zenith.

13998959 - The sparkling winter stars and constellations over the moonlit badlands of Dinosaur Provincial Park,Alberta on Feb. 4,2023. The waxing gibbous Moon is off frame at left providing the illumination on this very clear and mild night. Captured here in a vertical panorama from below the horizon to past the zenith.

Stars over Elbow Falls in the Kananaskis area of southern Alberta, shot under the light of the gibbous Moon on the last night of summer, September 22, 2015. The aspens were in full fall foliage on a very clear, mild night.

13900016 - Stars over Elbow Falls in the Kananaskis area of southern Alberta, shot under the light of the gibbous Moon on the last night of summer, September 22, 2015. The aspens were in full fall foliage on a very clear, mild night.

Mount Cephren at Lower Waterfowl Lake, in the light of the low waning Moon lighting the peaks but not the foreground. This is from the lakeside viewpoint on the Icefields Parkway in Banff National Park, Alberta. I shot this on a very clear night October 13, 2022. There was enough wind to ripple the water and blur any stellar reflections. The Milky Way is to the left of Cephren, but is being lost in the brightening moonlit sky.

13898858 - Mount Cephren at Lower Waterfowl Lake, in the light of the low waning Moon lighting the peaks but not the foreground. This is from the lakeside viewpoint on the Icefields Parkway in Banff National Park, Alberta. I shot this on a very clear night October 13, 2022. There was enough wind to ripple the water and blur any stellar reflections. The Milky Way is to the left of Cephren, but is being lost in the brightening moonlit sky.

The rising "supermoon" of July 12, 2022 embedded in the blue arc of Earth's shadow, rimmed by the pink Belt of Venus band of twilight colours, all over the badlands formations of Dinosaur Provincial Park on the Red Deer River in Alberta, Canada. The blue band on the horizon is the shadow of the Earth cast onto the atmosphere opposite the sunset point. The pink Belt of Venus above the shadow is from red sunlight still illuminating the upper atmosphere, an effect that lasts only a few minutes at sunset or sunrise, and requires a very clear sky to show up, as it was this night.

13898804 - The rising "supermoon" of July 12, 2022 embedded in the blue arc of Earth's shadow, rimmed by the pink Belt of Venus band of twilight colours, all over the badlands formations of Dinosaur Provincial Park on the Red Deer River in Alberta, Canada. The blue band on the horizon is the shadow of the Earth cast onto the atmosphere opposite the sunset point. The pink Belt of Venus above the shadow is from red sunlight still illuminating the upper atmosphere, an effect that lasts only a few minutes at sunset or sunrise, and requires a very clear sky to show up, as it was this night.

Way to the ocean in the beach and lagoon of Fakarava, Tuamotus Archipelago French Polynesia, Tuamotu Islands, South Pacific. Summer vacation concept. Beautiful turquoise clear water and blue sky with some white clouds. Fakarava, an atoll in the west of the Tuamotu group, French Polynesia

13848601 - Way to the ocean in the beach and lagoon of Fakarava, Tuamotus Archipelago French Polynesia, Tuamotu Islands, South Pacific. Summer vacation concept. Beautiful turquoise clear water and blue sky with some white clouds. Fakarava, an atoll in the west of the Tuamotu group, French Polynesia

13847160 - A healthy tropical fishes colorful with clear blue water. Malolo Island Resort and Likuliku Resort, Mamanucas island group Fiji

13846915 - Snorkeling in the crystal clear blue Pacific ocean on the tropical island of Rarotonga, Cook Islands, background with copy space

Tropical palm trees and lagoon of Fakarava, Tuamotus Archipelago French Polynesia, Tuamotu Islands, South Pacific. Summer vacation concept. Tropical coconut palm trees, coral gardens, beautiful turquoise clear water and blue sky with some white clouds. Fakarava, an atoll in the west of the Tuamotu group, French Polynesia

13845546 - Tropical palm trees and lagoon of Fakarava, Tuamotus Archipelago French Polynesia, Tuamotu Islands, South Pacific. Summer vacation concept. Tropical coconut palm trees, coral gardens, beautiful turquoise clear water and blue sky with some white clouds. Fakarava, an atoll in the west of the Tuamotu group, French Polynesia

71441010 - Columns and forms of the picturesque marble caves Cuevas de Marmol in the clear waters of Lago General Carrera, Chile

The stars of the northern sky over Castle Mountain in Banff National Park,Alberta. This was June 6,2023 on a very clear night,but bright with blue summer twilight at this latitude of 51° N in June. The W of Cassiopeia and the Milky Way are at right. Polaris is at top.

13999530 - The stars of the northern sky over Castle Mountain in Banff National Park,Alberta. This was June 6,2023 on a very clear night,but bright with blue summer twilight at this latitude of 51° N in June. The W of Cassiopeia and the Milky Way are at right. Polaris is at top.

A panorama of the northern stars in autumn over and reflected in the calm waters of Lake Edith in Jasper National Park, in the deep twilight. The Big Dipper and Ursa Major are at left, with Arcturus over Pyramid Mountain at far left. Capella is rising at right, and above it are the stars of Perseus and Cassiopeia. This was on a very clear mid-October night in 2022.

13900148 - A panorama of the northern stars in autumn over and reflected in the calm waters of Lake Edith in Jasper National Park, in the deep twilight. The Big Dipper and Ursa Major are at left, with Arcturus over Pyramid Mountain at far left. Capella is rising at right, and above it are the stars of Perseus and Cassiopeia. This was on a very clear mid-October night in 2022.

Jupiter (brightest), Saturn (to the left), and the Milky Way over the Saskatchewan River and the area of Howse Pass, on July 26, 2020. Mount Cephren is at left; the scene is framed to include Cephren. The nebulas and star clouds of the galactic centre area at right show up well on this very clear night. The bright Small Sagittarius Starcloud, aka M24, is most obvious, flanked by the star clusters M23 and M25 to the side, and the nebulas M17 and M16 above, and M8 and M20 below. The fuzzy globular cluster M22 is to the left of the large Lagoon Nebula, M8. Green airglow tints the sky.

13899645 - Jupiter (brightest), Saturn (to the left), and the Milky Way over the Saskatchewan River and the area of Howse Pass, on July 26, 2020. Mount Cephren is at left; the scene is framed to include Cephren. The nebulas and star clouds of the galactic centre area at right show up well on this very clear night. The bright Small Sagittarius Starcloud, aka M24, is most obvious, flanked by the star clusters M23 and M25 to the side, and the nebulas M17 and M16 above, and M8 and M20 below. The fuzzy globular cluster M22 is to the left of the large Lagoon Nebula, M8. Green airglow tints the sky.

A panorama of NLCs – noctilucent clouds – aka PMCs or polar mesospheric clouds, taken on June 20, 2022 about 11:40 pm MDT, from home in southern Alberta. After many cloudy nights and some clear nights with no NLCs, this was my first sighting since June 1. The bright luminous mesospheric clouds lit by sunlight at high altitude contrast with the dark tropospheric clouds to the left at low altitude.

13899582 - A panorama of NLCs – noctilucent clouds – aka PMCs or polar mesospheric clouds, taken on June 20, 2022 about 11:40 pm MDT, from home in southern Alberta. After many cloudy nights and some clear nights with no NLCs, this was my first sighting since June 1. The bright luminous mesospheric clouds lit by sunlight at high altitude contrast with the dark tropospheric clouds to the left at low altitude.

An urban nightscape of the constellations of Orion and Canis Major over the skyline of Calgary on January 18, 2018, on a very clear and moonless winter night, allowing stars to show up fairly well despite the light pollution. Sirius is above the Bow Tower building at left.

13899521 - An urban nightscape of the constellations of Orion and Canis Major over the skyline of Calgary on January 18, 2018, on a very clear and moonless winter night, allowing stars to show up fairly well despite the light pollution. Sirius is above the Bow Tower building at left.

The autumn constellations of Perseus and Cassiopeia above, with bright Capella in Auriga and the Pleiades star cluster in Taurus, at bottom, rising in the northeast over Lake Edith in Jasper National Park, on a clear autumn night. The Double Cluster is at centre, above the larger group of stars around Mirfak called the Perseus Association.

13898682 - The autumn constellations of Perseus and Cassiopeia above, with bright Capella in Auriga and the Pleiades star cluster in Taurus, at bottom, rising in the northeast over Lake Edith in Jasper National Park, on a clear autumn night. The Double Cluster is at centre, above the larger group of stars around Mirfak called the Perseus Association.

13898526 - The rising "supermoon" of July 12, 2022 embedded in the blue arc of Earth's shadow, rimmed by the pink Belt of Venus band of twilight colours, all over the badlands formations of Dinosaur Provincial Park on the Red Deer River in Alberta, Canada. The blue arc is the shadow of the Earth cast onto the atmosphere opposite the sunset point. The pink Belt of Venus is from red sunlight still illuminating the upper atmosphere, an effect that lasts only a few minutes at sunset or sunrise, and requires a very clear sky to show up, as it was this night.

An image of the entire sky and summer Milky Way, from home in southern Alberta, from my backyard, on September 12, 2015. The night was clear but not that transparent, as some humidity and haze added more than usual horizon glows reflecting yellow light pollution. But there was no aurora, in a week filled with auroras every night. The prominent red nebula overhead is the North America Nebula in Cygnus. South is at bottom, west to the right.

13898053 - An image of the entire sky and summer Milky Way, from home in southern Alberta, from my backyard, on September 12, 2015. The night was clear but not that transparent, as some humidity and haze added more than usual horizon glows reflecting yellow light pollution. But there was no aurora, in a week filled with auroras every night. The prominent red nebula overhead is the North America Nebula in Cygnus. South is at bottom, west to the right.

Badlands formations in Dinosaur Provincial Park lit by the light from the July 2022 "supermoon" Full Moon off frame at right and behind the hill, on a very clear night. The stars of the northern sky are set in a deep blue sky. Arcturus is at far left; the Big Dipper is at left (distorted somewhat by the panorama projection); Polaris is left of centre at top; Cassiopeia is right of center; Andromeda and Pegasus are below the W of Cassiopeia, and at far right is the star Altair.

13898004 - Badlands formations in Dinosaur Provincial Park lit by the light from the July 2022 "supermoon" Full Moon off frame at right and behind the hill, on a very clear night. The stars of the northern sky are set in a deep blue sky. Arcturus is at far left; the Big Dipper is at left (distorted somewhat by the panorama projection); Polaris is left of centre at top; Cassiopeia is right of center; Andromeda and Pegasus are below the W of Cassiopeia, and at far right is the star Altair.

Orion and Sirius rising over the Peloncillo Mountains of southwest New Mexico, on a clear night in December in the early evening. The Belt stars of Orion point down to Sirius, the Dog Star.

13897421 - Orion and Sirius rising over the Peloncillo Mountains of southwest New Mexico, on a clear night in December in the early evening. The Belt stars of Orion point down to Sirius, the Dog Star.

13847108 - Lab bottles with clear liquid and orange lids in a science lab in College Park, Maryland

13837175 - A sandy tropical beach and the clear blue waters of the Indian Ocean. Denis Island, The Republic of the Seychelles.

13792826 - Clear Water At White Sand Beach.

13885745 - Salmon spawn in Kronotsky Nature Reserve's clear running rivers; Kronotsky Zapovednik, Kamchatka, Russia

13885277 - Mushroom island, clear blue water, and a cloud-filled sky.

13882881 - Erosion evidence is clear on waterside rock formations.

Grand Prismatic Spring is one of the largest and most beautiful examples of a common hydrothermal feature in Yellowstone National Park and one of the largest hot springs in the United States. The prismatic, colorful features come from several sources; the deep blue in the center is the clear super-heated water circulating up from the subterranean heat source and shows a pair of convection currents, like a pair of eyes. As the water cools at the edges of the pool and on the sinter terraces, bacteria and algae produce the rainbow of colors. This hot spring was specifically mentioned in Osborne R

13882145 - Grand Prismatic Spring is one of the largest and most beautiful examples of a common hydrothermal feature in Yellowstone National Park and one of the largest hot springs in the United States. The prismatic, colorful features come from several sources; the deep blue in the center is the clear super-heated water circulating up from the subterranean heat source and shows a pair of convection currents, like a pair of eyes. As the water cools at the edges of the pool and on the sinter terraces, bacteria and algae produce the rainbow of colors. This hot spring was specifically mentioned in Osborne R

13885744 - Salmon spawn in Kronotsky Nature Reserve's clear running rivers; Kronotsky Zapovednik, Kamchatka, Russia

13882172 - Grand Prismatic Spring is one of the largest and most beautiful examples of a common hydrothermal feature in Yellowstone National Park and one of the largest hot springs in the United States. The prismatic or colorful features come from several sources; the deep blue in the center is the clear super-heated water circulating up from the subterranean heat source and as the water cools at the edges of the pool and on the sinter terraces, bacteria and algae produce the rainbow of colors. This hot spring was specifically mentioned in Osborne Russell's Journal of a Trapper, by the name of Boiling La

13885797 - Moon in the clear sky above Wat Arun or Temple of the Dawn; Bangkok, Thailand

Herd of American bison (Bison bison) grazing and keeping warm near the famous geyser, Old Faithful, with clouds of steam rising into the clear blue sky in the Upper Geyser Basin; Yellowstone National Park, United States of America

13882186 - Herd of American bison (Bison bison) grazing and keeping warm near the famous geyser, Old Faithful, with clouds of steam rising into the clear blue sky in the Upper Geyser Basin; Yellowstone National Park, United States of America

Smooth, Worn Rock Formations In The Foreground Sweeping Up To Tall Canyon Cliffs In The Background Under Clear Blue Skies, Capitol Reef National Park; Utah, United States Of America

13774258 - Smooth, Worn Rock Formations In The Foreground Sweeping Up To Tall Canyon Cliffs In The Background Under Clear Blue Skies, Capitol Reef National Park; Utah, United States Of America

13882140 - Grand Prismatic Spring is one of the largest and most beautiful examples of a common hydrothermal feature in Yellowstone National Park and one of the largest hot springs in the United States. The prismatic or colorful features come from several sources; the deep blue in the center is the clear super-heated water circulating up from the subterranean heat source and as the water cools at the edges of the pool and on the sinter terraces, bacteria and algae produce the rainbow of colors. This hot spring was specifically mentioned in Osborne Russell's Journal of a Trapper, by the name of Boiling La

13884421 - Cathedral Peak and a clear sky.; Yosemite National Park, California.

13882561 - Clouds are reflected in clear arctic waters.

13882501 - Shark in clear water near a mushroom island in the Aldabra Atoll.

13882560 - Clouds are reflected in clear arctic waters.

Mountain Haynes against a clear, blue sky alongside the snow-covered Madison River in winter; Yellowstone National Park, United States of America

13882265 - Mountain Haynes against a clear, blue sky alongside the snow-covered Madison River in winter; Yellowstone National Park, United States of America

13882144 - Grand Prismatic Spring is one of the largest and most beautiful examples of a common hydrothermal feature in Yellowstone National Park and one of the largest hot springs in the United States. The prismatic, colorful features come from several sources; the deep blue in the center is the clear super-heated water circulating up from the subterranean heat source and shows a pair of convection currents, like a pair of eyes. As the water cools at the edges of the pool and on the sinter terraces, bacteria and algae produce the rainbow of colors. This hot spring was specifically mentioned in Osborne R

13778304 - Karst limestone landscape of the burren on a blue sky clear summer day, Burren National Park; County Clare, Ireland

71421037 - Tourists bathe in the crystal clear turquoise waters of Cape Greco Peninsula, Agia Napa, Cyprus, Europe

71411923 - Underwater photograph of a textured sandbar in clear blue water near Staniel Cay, Exuma, Bahamas

Staircase to Church Santa Maria del Sasso Against Blue Clear Sky and Mountain on Lake Lugano in a Sunny Day in Morcote, Ticino in Switzerland.

71387091 - Staircase to Church Santa Maria del Sasso Against Blue Clear Sky and Mountain on Lake Lugano in a Sunny Day in Morcote, Ticino in Switzerland.

71411921 - Colorful soft and hard corals shine in the clear blue waters on a coral reef of of Staniel Cay, Exuma, Bahamas