Operational Manual (Online Help)
422
Ephemeris
A description of the path of a celestial body indexed by time (from the Latin word, ephemeris, meaning diary). The navigation
message from each GPS satellite includes a predicted ephemeris for the orbit of that satellite valid for the current hour. The
ephemeris is repeated every 30 seconds and is in the form of a set of 16 Keplerian-like parameters with corrections that
account for the perturbations to the orbit caused by the earth's gravitational field and other forces.
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