Bortle scale

Dr Paul Leyland

I support this request and would add another, closely related one.

The Bortle scale, as well as being a simple number, is also a measure of sky brightness in terms of equivalent stellar magnitude per square arcsecond. I can never remember that Bortle 4 is, for example, 20.49–21.69 and invariably have to look it up at

If the Bortle scale is added, could it be something along the lines of “Bortle 4 = 20.49-21.69 mag/(sq-as)”?