1 Ephemeris Longitude is the terrestrial dynamical longitude assuming a uniformly rotating Earth. 2 True Longitude is calculated by correcting the Ephemeris Longitude for the non-uniform rotation of Earth.
Longitude is measured positive to the East.
Since deltaT is not known in advance, the value used in the predictions is an extrapolation based on pre-1999 measurements. A ll eclipse calculations are by Fred Espenak, and he assumes full responsibility for their accuracy. Permission is freely granted to reproduce this data when accompanied by an acknowledgment.