1911 Encyclopædia Britannica/Retrograde

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Retro-cognition

1911 Encyclopædia Britannica, Volume 23

Retrograde

Retz, Seigneurs and Dukes of

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See also Retrograde motion on Wikipedia; and our 1911 Encyclopædia Britannica disclaimer.

30212081911 Encyclopædia Britannica, Volume 23 — Retrograde

RETROGRADE (from the Lat. retro, backwards, gradiri, to go), in astronomy, the direction of the apparent motion of a planet from E. to W.; the opposite of its regular motion around the sun, and due to the motion of the earth.