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anomalistic year
(Encyclopedia)anomalistic year ənŏmˌəlĭsˈtĭk [key], time required for the earth to go from the perihelion point once around the sun and back to the perihelion point. It is 365 days, 6 hr, 13 min, 53.0 sec of...airglow
(Encyclopedia)airglow, faint diffuse illumination of the sky originating in the upper atmosphere. Although it occurs at all times of day throughout the upper atmosphere, it is most typically visible to an observer ...Vega
(Encyclopedia)Vega vāˈgə [key], brightest star in the constellation Lyra; Bayer designation Alpha Lyrae; 1992 position R.A. 18h36.7m, Dec. +38°47′. A white main-sequence star of spectral class A0 V, its appar...trickster
(Encyclopedia)trickster, a mythic figure common among Native North Americans, South Americans, and Africans. Usually male but occasionally female or disguised in female form, he is notorious for exaggerated biologi...Thales
(Encyclopedia)Thales thāˈlēz [key], c.636–c.546 b.c., pre-Socratic Greek philosopher of Miletus and reputed founder of the Milesian school of philosophy. He is the first recorded Western philosopher. Thales ta...Parsons, Talcott
(Encyclopedia)Parsons, Talcott, 1902–79, American sociologist, b. Colorado Springs, Colo., educated at Amherst College (B.A., 1924), London School of Economics, and Univ. of Heidelberg (Ph.D., 1927). He was on th...Dyson, Freeman John
(Encyclopedia)Dyson, Freeman John dīˈsən [key], 1923–2020, British-American theoretical physicist and mathematician, studied Trinity College, Cambridge (B.A., 1945) and Cornell. He did bomber operations resear...stratosphere
(Encyclopedia)stratosphere strătˈəsfēr [key], second lowest layer of the earth's atmosphere. The level from which it extends outward varies with latitude; it begins c.51⁄2 mi (9 km) above the poles, c.6 or 7 ...radar
(Encyclopedia)radar, system or technique for detecting the position, movement, and nature of a remote object by means of radio waves reflected from its surface. Although most radar units use microwave frequencies, ...Saturn, in astronomy
(Encyclopedia) CE5 Saturn and its ring system as seen from Earth Saturn, in astronomy, 6th planet from the sun. Saturn has 82 confirmed natural satellites, many of which have not been named. Five of the discov...Browse by Subject
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