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Armstrong, Neil Alden
(Encyclopedia) Armstrong, Neil Alden, 1930–2012, American astronaut, b. Wapakoneta, Ohio, grad. Purdue Univ. (B.S., 1955), Univ. of Southern California (M.S., 1970). A U.S. Navy fighter pilot during…Pandora, in astronomy
(Encyclopedia) PandoraPandorapăndôrˈə [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn XVII (or S17), Pandora is an irregularly shaped (nonspherical…crescent
(Encyclopedia) crescent, emblematic representation of the quarter moon. The crescent and star, ancient Byzantine symbols that became the emblems of Constantinople, were also assumed as the standard…Aristarchus of Samos
(Encyclopedia) Aristarchus of SamosAristarchus of Samosărˌĭstärˈkəs, [key]Aristarchus of Samosărˌĭstärˈkəs, sāˈmŏs [key], fl. c.310 b.c.–c.230 b.c., Greek astronomer and mathematician of the…center of mass
(Encyclopedia) center of mass, the point at which all the mass of a body may be considered to be concentrated in analyzing its motion. The center of mass of a sphere of uniform density coincides with…Sin, in ancient Middle Eastern religions
(Encyclopedia) SinSinsĭn [key], moon god of Semitic origin, worshiped in ancient Middle Eastern religions. One of the principal deities in the Babylonian and Assyrian pantheons, he was lord of the…Endymion
(Encyclopedia) EndymionEndymionĕndĭmˈēən [key], in Greek mythology, young shepherd, loved by Selene (the moon). In one version of his legend, he asked Zeus for immortality and perpetual youth. Zeus…week
(Encyclopedia) week, period of time shorter than the month, commonly seven days. The ancient Egyptians used a 10-day period, as did the French under the short-lived French Revolutionary calendar. In…inclination
(Encyclopedia) inclination, in astronomy, the angle of intersection between two planes, one of which is an orbital plane. The inclination of the plane of the moon's orbit is 5°9′ with respect to the…Friedrich, Caspar David
(Encyclopedia) Friedrich, Caspar DavidFriedrich, Caspar Davidkäsˈpär däˈfēt frēˈdrĭkh [key], 1774–1840, German romantic landscape painter. After studying painting in Copenhagen he visited various…Trending
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