Astrophysics (index)about

Isophote

(line on a diagram indicating a level of brightness)

An Isophote on a diagram or map is a line indicating a level of brightness, in the manner that contour lines on a map can indicate altitude. A diagram of a planet (e.g., at a certain point in time) might be given isophotes indicating the levels of brightness, i.e., from the combination of the planet's Emission and its reflection of the star's Electromagnetic Radiation.


(diagrams)
http://en.wikipedia.org/wiki/Isophote

index