Dear robert:

"robert" wrote in message
oups.com...
....
But it don't have the range for Venus or the Moon. I know the bright
star Alpha Carina (Canopus) has magnitude of - 0.72 which is of flux of
something like 6.8 x 10-5 W/m2. (6.8 x 10^-5 watt per squre mtre).

Greg Neill didn't touch in this part...
The flux from Venus and the Moon is 0 to some maximum value, depending on
the mutual relationship between the Sun, the observed "reflective" body,
and the observer. Canopus is internally powered, and is not therefore
variable (or variable in the same way).

David A. Smith