Bible Encyclopedias
Retrograde
1911 Encyclopedia Britannica
(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.
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Retrograde'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/r/retrograde.html. 1910.