These constants are exported by the sidereal.py module.
The year when the Gregorian calendar took over from the flawed Julian calendar: 1583.
The value of (π/180). Multiply degrees by this value to get radians.
The value of (2π). Used for normalizing angles.
The value of (π/12). Multiply hours by this value to get radians.
A constant amount removed from Julian dates for
internal storage, to allow for more precision in
times of day. For a discussion, see Section 9, “
class JulianDate: Julian date and