(Encyclopedia) retrograde motion, in astronomy, real or apparent movement of a planet, dwarf planet, moon, asteroid, or comet from east to west relative to the fixed stars. The most common direction…
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Sun, Moon, and Stars: September 2001
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On November 14, 2016, the world will experience its largest supermoon since January 1948. AP Photo/Geert Vanden Wijngaert Related Links Perpetual Calendar It isn…
(Encyclopedia) space science, body of scientific knowledge as it relates to space exploration; it is sometimes also called astronautics. Space science draws on the conventional sciences of physics,…
For terms in boldface, see Astronomical Terms.DayPhenomenonHour2Mars is 4° south of the Moon.11003Pallas, the second-largest asteroid, appears to be motionless in the sky as it goes from…
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