Dne 03/12/2016 v 17:48 Mike Dworetsky napsal(a):


A planet or moon or asteroid is a reasonable approximation to a BB if it
does not have an atmosphere, and if it does, the overall emission of
energy will balance the absorption of energy if you take into account
all the sources of opacity and reflection (albedo) at different
wavelengths.


Hm, this is refuted by huan eyes look.
Earth in visible region is far from black body behavior.

The very most surfaces are far from be anywhere near the black.

In the thermal IR region near 10 um
Earth is much closer to BB, especially oceans.

--
Poutnik ( The Pilgrim, Der Wanderer )

A wise man guards words he says,
as they say about him more,
than he says about the subject.