* Time of day: Sunlight is strongest at noon when the sun is directly overhead.
* Time of year: The Earth's orbit is elliptical, so we are slightly closer to the sun in January than in July.
* Latitude: The angle of the sun in the sky changes with latitude, meaning sunlight is more concentrated at the equator than at the poles.
* Cloud cover: Clouds block sunlight, reducing the intensity reaching the Earth's surface.
* Atmospheric conditions: The atmosphere can absorb and scatter sunlight, further reducing the intensity reaching the surface.
Average Solar Irradiance:
The average solar irradiance at the top of Earth's atmosphere is about 1361 watts per square meter (W/m²), known as the solar constant.
Solar Irradiance at the Earth's Surface:
After accounting for atmospheric absorption and scattering, the average solar irradiance reaching the Earth's surface is around 1000 W/m² on a clear day at noon.
Important Note:
These values are just averages. The actual solar irradiance at a specific location and time can vary significantly depending on the factors mentioned above.
