Changelog:
==========
- The Moon's visual magnitude formula has been upgraded, so its ".mag"
should more closely match other modern estimates of its brightness.
- Fix: the routines to find risings and settings would on rare occasion
run forever (usually for sunrises or sunsets at very high latitude).
They now limit their running time and refuse to run forever.
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>