The coordinates of the Sun and Moon used in some eclipse predictions have been calculated on the basis of the JPL DE430 solar system ephemeris. This ephemeris consists of computer representations of the positions, velocities and accelerations of major Solar System bodies, tabulated at equally spaced intervals of time, covering the years 1550 to 2650.

DE430 is a higher accuracy version of the DE431 but it covers a smaller time span. DE430 reportedly has the most accurate lunar ephemeris to date and spans the time interval 1549 Dec 21 to 2650 Jan 25. The interpolating accuracy of the DE430 is no worse than 25 meters for any planet and no worse than 1 meter for the Moon. See Jet Propulsion Laboratory Developmental Ephemeris for more information of these ephemerides.