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Interview: Alan W. Irwin, developer of Time Ephemerides

Oct 06, 2011, 15:02 (0 Talkback[s])

[ Thanks to Edwood Ocasio for this link. ]

"his project (timeephem.sf.net) consists of software and associated data to help create, manipulate, and interpolate time ephemerides of the Earth. Such ephemerides are used to correct pulse arrival times from pulsars (and any other Earth-based astronomical or spacecraft observation where precise timing is critical) for the general relativistic distortion of the rate of Earth-based clocks. Such distortion is a well-known effect due to the time-varying velocity of Earth-based clocks relative to the solar system barycenter and also due to the time-varying gravitational potential at the position of such clocks due to the detailed motions of all major masses in the solar system relative to the clock location. Thus, an important prerequisite of any calculation of a time ephemeris is a JPL planetary ephemeris, which represents some of man's best knowledge of the masses, positions and velocities of all major solar system objects."

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