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". Prism splitting light Sunlight in the broad sense is the total spectrum of electromagnetic radiation given off by the Sun. ... It has been suggested that this article or section be merged with Dawn. ... Diffuse sky radiation is solar radiation reaching the earths surface after having been scattered from the direct solar beam by molecules or suspensoids in the atmosphere. ... Earth is the third planet in the Solar system. ...

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. The Sun is the spectral type G2V yellow star at the center of Earths solar system. ... The lux (symbol: lx) is the SI derived unit of illuminance or illumination. ... Noon is the time exactly through the day, written 12:00 in the 24-hour clock and 12:00 noon in the 12-hour clock. ... According to the International Society for the Study of Pain, there are two different terms: pain and nociception. ... The lux (symbol: lx) is the SI derived unit of illuminance or illumination. ... A streetlight in front of a red sky at night A street light, also known as a light standard, is a raised light on the edge of a road, turned on or lit at a certain time every night. ... Photo taken during the 1999 eclipse. ...

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. To meet Wikipedias quality standards, this article or section may require cleanup. ... Seasonal affective disorder, or SAD, also known as winter depression is an affective, or mood disorder. ...

Daylighting is lighting, such as windows and skylights whose light is really daylight. This type of lighting is chosen to save energy and also for decoration. A window is an opening in an otherwise solid, opaque surface through which light and sometimes air can pass. ... The word skylight, when used alone, has several possible meanings in the English language. ... This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ...

In recent years, work has taken place to recreate the effects of daylight artificially. This is however expensive in terms of both equipment and energy consumption and is applied almost exclusively in specialist areas such as movie-making, where light of such intensity is required on a professional level.

See also

• Daylight map