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.
[The sun by its self is not warming the earth from -273 deg C to what we have today.]
According to the Apollo 14 mission report, the maximum temperature during lunar day is 1360 F and the minimum temperature during lunar night is minus 110 F.
The temperature differential is entirely due to the alternating presence and absence of solar radiation.