retrogradation (n.) The act of retrograding, or moving backward.
retrogradation (n.) The state of being retrograde; decline.
Sailor's Word-BookThe Sailor's Word-Book⛵
retrogradation An apparent motion of the planets contrary to the order of the signs, and to their orbital march. The arc of retrogradation is the angular distance thus apparently traversed. Mars may be watched as an instance.
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