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precession (n.)

"act of going before or moving forward, an advance," 1590s, from Late Latin praecissionem (nominative praecissio) "a coming before," from past-participle stem of Latin praecedere "to go before" (see precede). Originally used in reference to calculations of the equinoxes, which come slightly earlier each year, a phenomenon discovered by Hipparchus (190 B.C.E.-120 B.C.E.).

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