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sunlight

Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light. On Earth, sunlight is filtered through Earth's atmosphere, and is obvious as daylight when the Sun is above the horizon. When the direct solar radiation is not blocked by clouds, it is experienced as sunshine, a combination of bright light and radiant heat. When it is blocked by clouds or reflects off other objects, it is experienced as diffused light. The World Meteorological Organization uses the term "sunshine duration" to mean the cumulative time during which an area receives direct irradiance from the Sun of at least 120 watts per square meter. Other sources indicate an "Average over the entire earth" of "164 Watts per square meter over a 24 hour day". The ultraviolet radiation in sunlight has both positive and negative health effects, as it is both a principal source of vitamin D3 and a mutagen. Sunlight takes about 8.3 minutes to reach Earth from the surface of the Sun. A photon starting at the center of the Sun and changing direction every time it encounters a charged particle would take between 10,000 and 170,000 years to get to the surface. Sunlight is a key factor in photosynthesis, the process used by plants and other autotrophic organisms to convert light energy, normally from the Sun, into chemical energy that can be used to fuel the organisms' activities.
Norway. - Wonderful and magical Norway.
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Norway.

Added today by Zeta

25

Sunset. - Sunset in the tropics.
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Sunset.

Added today by Zeta

28

Lubuskie. - National Park Ujście Warty.
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Lubuskie.

Added yesterday by Zeta

25

Colors of autumn. - Fiery colors of colorful autumn.
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Colors of autumn.

Added 2 days ago by Grażyna

40

Oliwa Park. - Oliwa Park in Gdansk.
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Oliwa Park.

Added 2 days ago by Zeta

66

Pond in the park. - Pond in an autumn park.
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Pond in the park.

Added 2 days ago by Zeta

17

White bench. - Autumnal forest with a white bench.
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White bench.

Added 2 days ago by Zeta

24

Lane in the forest. - A path in a foggy forest.
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Lane in the forest.

Added 2 days ago by Zeta

34

Bieszczady. - Autumn in the Bieszczady.
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Bieszczady.

Added 3 days ago by Zeta

51

Autumn at the seaside. - Our sea is beautiful at any time of the year.
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Autumn at the seaside.

Added 3 days ago by Zeta

87

Autumn leaf - Autumnal yellow maple leaf, full autumn
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Autumn leaf

Added 4 days ago by jaija

32

a boat on the lake - Indian canoe on the lake. Nice view.
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a boat on the lake

Added 4 days ago by indianin

73

A magical sunset - A sunset full of magic. Nature is amazing, surprises with its charms. Trees have a soul.
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A magical sunset

Added 4 days ago by Ewa

84 1

nature itself - nature itself ---- leaves, leaves
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nature itself

Added 6 days ago by Basiunia

80

The memory of spring. - A memory of spring.
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The memory of spring.

Added 6 days ago by Grażyna

269 1

sunset - ears of grass at sunset
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sunset

Added 9 days ago by sandra

139 1

road through the forest - road through the autumn forest
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road through the forest

Added 10 days ago by Agul

257 1

Sky-like landscape. - Sky landscape ...
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Sky-like landscape.

Added 12 days ago by Grażyna

52

Colorful autumn. - Colorful autumn in painting.
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Colorful autumn.

Added 13 days ago by Grażyna

67

Very autumn. - Beautiful and sunny autumn.
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Very autumn.

Added 2 weeks ago by Grażyna

147 1

It used to be spring. - A memory of spring.
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It used to be spring.

Added 2 weeks ago by Grażyna

96 1

bench in the park - bench in the park, autumn landscape
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bench in the park

Added 2 weeks ago by Elizabeth

179

Morning on the Podhale. - Morning fog over Podhale.
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Morning on the Podhale.

Added 2 weeks ago by Zeta

85 1

Crossroads. - Go, keep going towards the sun - singing 2 + 1. And you which path?
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Crossroads.

Added 2 weeks ago by Zeta

157 1

Fog on the fields. - Autumn fog over the fields.
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Fog on the fields.

Added 2 weeks ago by Zeta

80 1

Road among birches. - Autumnal road among birches.
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Road among birches.

Added 2 weeks ago by Zeta

102 2

Sunset. - Sunset on the fields.
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Sunset.

Added 2 weeks ago by Grażyna

45

Autumn in the forest. - A very nostalgic picture. Autumn, however, brings sadness.
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Autumn in the forest.

Added 2 weeks ago by Zeta

189 1

sunset in Dziwnów - sunset in Dziwnów
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sunset in Dziwnów

Added 2 weeks ago by Druuna

32

morning fog - landscape, forest, fog, rays of the sun
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morning fog

Added 3 weeks ago by sandra

51 1

beautiful - oj la la la la la la la
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beautiful

Added 3 weeks ago by MAJAMA

202

jesiennie - autumn landscape, alley, trees
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jesiennie

Added 3 weeks ago by Elizabeth

150

Lake Pobondzie. - Lake Pobondzie in the Suwałki region.
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Lake Pobondzie.

Added 3 weeks ago by Zeta

66 1