Do the earth and the moon reflect the different fractions of total solar radiation proportionally? Reading on this website that: &quot;All of the energy from the Sun that reaches the Earth arrives as solar radiation&quot;. &quot;Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays&quot;.
Here Albedo is explained to refering to the entire spectrum of solar radiation.
The earth and the moon obviously reflect different amounts of total solar radiation, but question is if they reflect the different solar radiation fractions proportionally?
(Proportional reflection is when all the different light spectrum fractions increases, or decreases, with the same percentages.)
Or do earth and/or moon reflect light dis-proportionally?
Rephrasing the question:
We know how much the difference in visible geometric albedo between earth and the moon
is, but is that figure the same when comparing  reflection of infrared, or any of the other parts of the light spectrum?
The obvious answer is: &quot;of course&quot;. Different colour simply means different wavelength-dependent reflection; different brightness means different wavelength-independent reflection. Earth and moon have different colours when viewed from space.
The real question is by how much does it differ as a function of wavelength. There are already here nice comparisons of the solar spectrum and the Moon's spectrum.
There's a relative measurement of Earth's reflectance by Björn et al (2009). Similarily Turnbull et al (2006) discuss the reflectance of Earth compared to the Moon. Reality is complicated as exact reflectance depends on the observation angle and angle of incidence - and the exact materials looked at which varies slightly for the Moon and can vary a lot for Earth, especially when considering cloud and ocean coverage. Earth might be slightly redder due to increased thermal radiation, especially in the absorption bands of water in the atmosphere.