Algorithms for the eclipse predictions were developed by Espenak primarily from the Explanatory Supplement [1974] with additional algorithms from Meeus, Grosjean and Vanderleen [1966]. The solar and lunar ephemerides were generated from the JPL DE200 and LE200, respectively. All eclipse calculations were made using a value for the Moon's radius of k=0.2722810 for umbral contacts, and k=0.2725076 [adopted IAU value] for penumbral contacts. Center of mass coordinates were used except where noted. An extrapolated value for Delta_T of 59.5 seconds was used to convert the predictions from Terrestrial Dynamical Time to Universal Time.
The primary source for geographic coordinates used in the local circumstances tables is The New International Atlas (Rand McNally, 1991). Elevations for major cities were taken from Climates of the World (U. S. Dept. of Commerce, 1972).