Variable J2000_EPOCH`Const`

J2000_EPOCH: 2451545 = 2451545.0

Julian Date of J2000.0 epoch (January 1, 2000, 12:00 TT).

Remarks

The fundamental reference epoch for modern astronomical calculations. All orbital elements and positions are typically referred to this epoch.

Source

IAU 1976 System of Astronomical Constants

Source

Meeus, "Astronomical Algorithms", p. 62