Sunlight

Sunlight, in the broad sense, is the total of  given off by the On , sunlight ithrough the atmosphere, and solar radiation is obvious as when the Sun is above the

When the direct solar radiation is not blocked by clouds, it is experienced as sunshine, a combination of bright light and . When it is blocked by the clouds or reflects off of other objects, it is experienced as diffused light.

Direct sunlight has a luminous efficacy of about 93per watt of radiant flux, which includes  , and light. Bright sunlight provides of approximately 100,000 or per square meter at the Earth's surface.

Sunlight is a key factor in , a process vital foron Earth.

Theuses the term "sunshine duration" to mean the cumulative time during which an area receives direct  from the Sun of at least 120per square

Sunlight may be recorded using a or . Sunlight takes about 8.3 minutes to reach the Earth.