New answers tagged


It is the luminosity in a straight strip like this: (Credit: West 29 / CC BY-SA from here) where the center of the strip passes a distance $x$ from the center of the circle at closest approach. So starting from the center and moving out, each successive strip would have a progressively larger value of $x$, but $x$ is a constant for a given strip (with $x = ...

Top 50 recent answers are included