Question

How bright is the night sky in $\frac{\mathrm{W}}{\mathrm{m}^2}$?

Answer 1

The Brightness of the Night Sky. "When darkness is at its darkest, that is the beginning of all light." The darkness, or brightness, of the night sky is a topic of interest to all amateur astronomers and astrophotographers.
Thanks

Answer 2

$\huge \bf\frac{W}{m}^2$



The Night Sky April 2019 Compiled by Ian Morison. This page, updated monthly, will let you know some of the things that you can look out for in the night sky.