The amount of available incoming solar radiation depends on cloud cover,day of year,time of day,and longitude.

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Cloud cover, day of year, time of day, and longitude all affect the amount of available incoming solar radiation. Clouds can block or reflect sunlight, the angle of the sun in the sky changes with the day of year and time of day, and the amount of atmosphere the sunlight must pass through changes with longitude. Therefore, the amount of available incoming solar radiation varies depending on these factors.

The Amount of Available Incoming Solar Radiation Depends on Cloud