# Emissivity not accounted for in Equilibrium Temperatures of Planets

I'm trying to understand how to calculate the Equilibrium Temperatures of Planets. This is the beginning of my working for it...

However, whenever I look at external sources, (like this Princeton source), they don't account for the emissivity of the planet on line 3, and hence my calculations deviate from theirs. Why is this?

• But the Princeton source accounts for $(1 - A)$ all over the place, corresponding to $(1-\alpha)$ or $e$ in your sheet. So I don't see any difference. – Thomas Fritsch Apr 1 at 14:47
• @ThomasFritsch It wasn’t accounted for when they were getting the formula for the power emitted by the planet. They only accounted for e when they were expressing power absorbed in relation to solar constant. I accounted for it in both, because I have the understanding that e matters for both absorption and emission. – Main Man Andy Apr 1 at 14:59