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Jump to navigationJump to searchCreated page with 'File:lighterstill.jpgright|frame ==Origin== West Frisian ''sinneljacht'', Middle Dutch ''sonnelicht'', (Dutch ''zonlicht''), Ol...'
[[File:lighterstill.jpg]][[File:1903_Sunlight_sunlight_forest.jpg|right|frame]]
==Origin==
West Frisian ''sinneljacht'', Middle Dutch ''sonnelicht'', (Dutch ''zonlicht''), Old High German ''sunnalioht'' and ''sunnûn lioht''
*[http://en.wikipedia.org/wiki/13th_century 13th Century]
==Definition==
1 : the [[light]] of the [[sun]] : sunshine
==Description==
'''Sunlight''', in the broad sense, is the total [[frequency]] [[spectrum]] of [[electromagnetic]] radiation given off by the [[Sun]], particularly [http://en.wikipedia.org/wiki/Infrared infrared], visible, and [http://en.wikipedia.org/wiki/Ultraviolet ultraviolet] light. On [[Earth]], sunlight is filtered through the [[Earth]]'s [[atmosphere]], and solar [[radiation]] 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 the clouds or [[reflects]] off of other objects, it is experienced as [[diffused]] light.
The [http://en.wikipedia.org/wiki/World_Meteorological_Organization 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.
Sunlight may be recorded using a [http://en.wikipedia.org/wiki/Sunshine_recorder sunshine recorder], [http://en.wikipedia.org/wiki/Pyranometer pyranometer] or [http://en.wikipedia.org/wiki/Pyrheliometer pyrheliometer]. Sunlight takes about 8.3 minutes to reach the Earth.
On [[average]], it takes energy between 10,000 and 170,000 years to leave the [[sun]]'s interior and then be emitted from the [[surface]] as [[light]].
Direct sunlight has a luminous efficacy of about 93 lumens per watt of [http://en.wikipedia.org/wiki/Radiant_flux radiant flux]. Bright sunlight provides illuminance of approximately 100,000 lux or lumens per square meter at the Earth's surface.
Sunlight is a key factor in [http://en.wikipedia.org/wiki/Photosynthesis photosynthesis], a [[process]] vital for many living [[beings]] on [[Earth]].[http://en.wikipedia.org/wiki/Sunlight]
[[Category: Physics]]
==Origin==
West Frisian ''sinneljacht'', Middle Dutch ''sonnelicht'', (Dutch ''zonlicht''), Old High German ''sunnalioht'' and ''sunnûn lioht''
*[http://en.wikipedia.org/wiki/13th_century 13th Century]
==Definition==
1 : the [[light]] of the [[sun]] : sunshine
==Description==
'''Sunlight''', in the broad sense, is the total [[frequency]] [[spectrum]] of [[electromagnetic]] radiation given off by the [[Sun]], particularly [http://en.wikipedia.org/wiki/Infrared infrared], visible, and [http://en.wikipedia.org/wiki/Ultraviolet ultraviolet] light. On [[Earth]], sunlight is filtered through the [[Earth]]'s [[atmosphere]], and solar [[radiation]] 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 the clouds or [[reflects]] off of other objects, it is experienced as [[diffused]] light.
The [http://en.wikipedia.org/wiki/World_Meteorological_Organization 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.
Sunlight may be recorded using a [http://en.wikipedia.org/wiki/Sunshine_recorder sunshine recorder], [http://en.wikipedia.org/wiki/Pyranometer pyranometer] or [http://en.wikipedia.org/wiki/Pyrheliometer pyrheliometer]. Sunlight takes about 8.3 minutes to reach the Earth.
On [[average]], it takes energy between 10,000 and 170,000 years to leave the [[sun]]'s interior and then be emitted from the [[surface]] as [[light]].
Direct sunlight has a luminous efficacy of about 93 lumens per watt of [http://en.wikipedia.org/wiki/Radiant_flux radiant flux]. Bright sunlight provides illuminance of approximately 100,000 lux or lumens per square meter at the Earth's surface.
Sunlight is a key factor in [http://en.wikipedia.org/wiki/Photosynthesis photosynthesis], a [[process]] vital for many living [[beings]] on [[Earth]].[http://en.wikipedia.org/wiki/Sunlight]
[[Category: Physics]]
