Jet Propulsion Laboratory Development Ephemeris
EPHEMERIS PRODUCED AT THE JET PROPULSION LABORATORY FOR SPACECRAFT NAVIGATION AND ASTRONOMY
DE400; DE403; DE405; DE406; Jet Propulsion Laboratory Developmental Ephemeris; DE200; DE430
Jet Propulsion Laboratory Development Ephemeris (abbreved JPL DE(number), or simply DE(number)) designates one of a series of mathematical models of the Solar System produced at the Jet Propulsion Laboratory in Pasadena, California, for use in spacecraft navigation and astronomy. The models consist of numeric representations of positions, velocities and accelerations of major Solar System bodies, tabulated at equally spaced intervals of time, covering a specified span of years.