- albedo of the earth's surface
- angle of the sun
above the horizon
- curvature of the earth
- degree of "spreading out"
at earth's surface
- distance between
earth and sun
- distance traveled
through Earth's atmosphere
- ellipticity
of the earth's orbit
- fraction of radiation
absorbed/reflected
in Earth's atmosphere
- intensity of solar radiation
at top of the atmosphere,
directly facing the sun
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- insolation
on a horizontal surface
at the earth's surface
- latitude
- revolution of earth
around the sun
- rotation of the earth
- seasons
- tilt of earth's
axis of rotation,
and its constant orientation
(relative to distant stars)
- time of day
- time of year
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