[VxH]

[Your figures are about right but where is the rest of the heat come from? ]

 

Solar radiation is absorbed by particles within the earth's atmosphere.

 

[Remember space is cold.]

 

Space is a vacuum and there is nothing to absorb the solar radiation.

 

 

If heat comes from the earth then why does it get cold at night in the desert?

 

http://en.wikipedia.org/wiki/Solar_radiation

[VxH]

>>within the earth's atmosphere.

Should be:

within the earth's surface and atmosphere.

[Steve Van Doorn]

Space is a vacuum that is my point, there is nothing on earth that gets as cold as space which is around -273 deg C.

The sun by its self is not warming the earth from -273 deg C to what we have today. I am not disagreeing that the sun warms the earth, but what I am saying is the earth it self is doing most of the warming.
how much? I am not sure.