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These constants are exported by the sidereal.py module.
FIRST_GREGORIAN_YEAR
The year when the Gregorian calendar took over from the flawed Julian calendar: 1583.
PI_OVER_180
The value of (π/180). Multiply degrees by this value to get radians.
TWO_PI
The value of (2π). Used for normalizing angles.
PI_OVER_12
The value of (π/12). Multiply hours by this value to get radians.
JULIAN_BIAS
A constant amount removed from Julian dates for
internal storage, to allow for more precision in
times of day. For a discussion, see Section 10, “class JulianDate: Julian date and
time”.