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Midtown Manhattan during civil twilight, demonstrating blue hour
Midtown Manhattan during civil twilight, demonstrating blue hour
Civil twilight in a small town in the Mojave Desert
Civil twilight in a small town in the Mojave Desert
Evening nautical twilight on Lake Ontario, Canada
Evening nautical twilight on Lake Ontario, Canada
Long exposure of nautical twilight in a small town in the Mojave Desert
Long exposure of nautical twilight in a small town in the Mojave Desert
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A clear daytime sky, looking toward the zenith
A clear daytime sky, looking toward the zenith
A Space Shuttle (Mission STS-43) photograph of the Earth over South America taken on August 8, 1991, which captures the double layer of Pinatubo aeros
A Space Shuttle (Mission STS-43) photograph of the Earth over South America taken on August 8, 1991, which captures the double layer of Pinatubo aerosol clouds (dark streaks) above lower cloud tops.
Under more-or-less direct sunlight, dark shadows that limit photosynthesis are cast onto understorey leaves. Within the thicket, very little direct su
Under more-or-less direct sunlight, dark shadows that limit photosynthesis are cast onto understorey leaves. Within the thicket, very little direct sunlight can enter.
Well lit understorey areas due to overcast clouds creating diffuse/soft sunlight conditions, that permits photosynthesis on leaves under the canopy.
Well lit understorey areas due to overcast clouds creating diffuse/soft sunlight conditions, that permits photosynthesis on leaves under the canopy.