The Visible pass rule, as its three numbers by default. A
Pass is Visible while, all at once, the Observer is in Night (the Sun at
least 6 degrees below the horizon, nautical twilight or darker), the
Satellite is Sunlit, it is at least 10 degrees above the horizon, and its
predicted brightness is magnitude 4.0 or brighter, the faintest a naked
eye finds under a city sky. A caller who sets no threshold of their own
(VisibleRule) gets these.
The Visible pass rule, as its three numbers by default. A Pass is Visible while, all at once, the Observer is in Night (the Sun at least 6 degrees below the horizon, nautical twilight or darker), the Satellite is Sunlit, it is at least 10 degrees above the horizon, and its predicted brightness is magnitude 4.0 or brighter, the faintest a naked eye finds under a city sky. A caller who sets no threshold of their own (
VisibleRule) gets these.