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 synthesize …

Time for sunrise, sunset, moonrise, and moonset in Chicago – Illinois – USA. Dawn and dusk (twilight) times and Sun and Moon position. Takes into account Daylight Saving Time (DST).

2 days ago · Check accurate sunrise and sunset times for any day and any location in the world. Sunrise-Sunset © 2014 - 2026. Sunrise and sunset in Chicago, Illinois as well as day length, twilight …

Dec 24, 2025 · Sunlight, solar radiation that is visible at Earth’s surface. The amount of sunlight is dependent on the extent of the daytime cloud cover. Some places on Earth receive more than 4,000 …

Sunlight, also known as solar radiation, refers to the incoming light to the Earth that originated from the Sun. This light represents a portion of the electromagnetic spectrum that includes infrared, visible …

Sunlight is the portion of the electromagnetic radiation which is emitted by the Sun and received by the Earth, in particular the visible light perceptible to t...

The tables below pull together numbers on the amount of sunshine that each US state usually has in a year. There's information by state on the annual averages for percent, hours and days of sun. The % …

Feb 20, 2025 · Sunlight provides vitamin D, boosts mood and aids in sleep. Recommendations vary, but just 10 to 30 minutes of sun exposure on bare skin will do the trick.

When sunlight strikes the Earth, it is mostly reflected or absorbed. Reflected light bounces back into space while absorbed light is the source of energy that drives processes in the atmosphere, …

Sunrise / Sunset times Chicago. With first light and last light times, and a graphical view of local daylight hours.