(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…
Hades Takes a Wife: PersephoneClassical MythologyWhat the Hell? Adventures in the UnderworldHades Takes a Wife: PersephoneThe Cunning Rogue: SisyphusThe Not-So-Heavenly Host: TantalusUndying Love:…
(Encyclopedia) Clarke, Arthur C. (Sir Arthur Charles Clarke), 1917–2008, British science fiction writer. During World War II he served as a radar instructor and aviator in the Royal Air Force. After…
(Encyclopedia) geophysics, study of the structure, composition, and dynamic changes of the earth, its atmosphere, hydrosphere and magnetosphere, based on the principles of physics. The term was…
(Encyclopedia) Hutton, James, 1726–97, Scottish geologist, chemist, and naturalist. He was initially attracted to chemistry; he entered the legal profession at the Univ. of Edinburgh; turned to…
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Phases of the moon
phase, in astronomy, the measure of how much of the illuminated surface of a planet or satellite can be seen from a point at a distance from that body; the…
(Encyclopedia) catastrophismcatastrophismkətăsˈtrəfĭzəm [key], in geology, the doctrine that at intervals in the earth's history all living things have been destroyed by cataclysms (e.g., floods or…
In 2017, summer begins June 21, 12:24 A.M. EDT (04:34 UT*) by Karen Barss Related Links Earth's Seasons: Video and Activities Summer Solstice The Solar System The Sun…
Light-year (distance traveled by light in one year) 5,880,000,000,000 mi Parsec (parallax of one second, or stellar distances) 3.259 light-years Velocity of light…
(Encyclopedia) San Andreas fault, great fracture (see fault) of the earth's crust in California. It is the principal fault of an intricate network of faults extending more than 600 mi (965 km) from…
