The Limb of the Sun

The video explains the brightness variations in flames and the sun, focusing on limb darkening and brightening effects. It describes how the sun's edges appear darker and redder due to temperature differences and viewing angles. The reverse effect is seen in some flames, where edges are brighter due to optimal oxygen and fuel mixture. The video also touches on similar effects in nebulas, explaining the geometrical reasons behind these phenomena.

What happens to the visibility of gas when looking at the edge of a partially transparent sphere?

Describe the geometrical effect observed when viewing a candelabra from the side.