Daylight or the light of day is the combination of all direct and indirect sunlight outdoors exclusively during the daytime (and perhaps twilight). This includes direct sunlight, diffuse sky radiation, and (often) any/all of the above reflected from the Earth and terrestrial objects. Daytime is the period of time each day when daylight occurs. While perceived moonlight is in fact light from the sun reflected towards the Earth, and is hence to be considered "indirect sunlight", it is not considered daylight as it occurs outside of the hours that one would consider "daytime".

Daylight is present, to some degree, whenever the sun is up, but the outdoor illuminance can vary from 100,000 lux for direct sunlight at noon, which may cause eye discomfort, to less than 5 lux for the thickest storm clouds with the sun at the horizon, which may make shadows from distant streetlights visible. It may be darker under unusual circumstances such as a solar eclipse or very high levels of atmospheric smoke.

Daylight is widely accepted to have a positive psychological effect on the human being, and consequently more cases of mental health problems are registered during the winter months than during the summer months due to the shortened periods of daylight. Cases of depression specifically linked to limited daylight are referred to as seasonal affective disorder.

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@jaredotoole let's move to Hawaii where this is no daylight savings time
arinehartdc (Alex Rinehart, MSACN) Thu, 03 Dec 2009 01:20:08 -0000
@jaredotoole let's move to Hawaii where this is no daylight savings time
@KimB Sometimes I get confused because the US uses the daylight savings thing. Here we don't use it .
graceburris (Grace Angeli Burris) Thu, 03 Dec 2009 01:15:35 -0000
@KimB Sometimes I get confused because the US uses the daylight savings thing. Here we don't use it .
daylight ♫ http://blip.fm/~h7hg8
thomasmmm (thomas mercado ™) Thu, 03 Dec 2009 01:09:09 -0000
daylight ♫ http://blip.fm/~h7hg8
such a weird time of day when you go underground at civic center in daylight and come out at west Oakland in dark.
isabelcali (isabel ) Thu, 03 Dec 2009 01:04:38 -0000
such a weird time of day when you go underground at civic center in daylight and come out at west Oakland in dark.
Uh oh. Running out of daylight... And my front headlight is dead. :-(
emtgirl (Renee) Thu, 03 Dec 2009 01:02:08 -0000
Uh oh. Running out of daylight... And my front headlight is dead. :-(
@andykhouri Did that happen during the daylight hours? I work in a bar, I don't see the sun...or the early updates on HuffPost. haha
gbwilliams (Brett Williams) Thu, 03 Dec 2009 01:01:36 -0000
@andykhouri Did that happen during the daylight hours? I work in a bar, I don't see the sun...or the early updates on HuffPost. haha

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