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synodic period

(Encyclopedia)synodic period sĭnŏdˈĭk [key], in astronomy, length of time during which a body in the solar system makes one orbit of the sun relative to the earth, i.e., returns to the same elongation. Because ...

Park Ridge

(Encyclopedia)Park Ridge, city (1990 pop. 36,175), Cook co., NE Ill., a suburb adjacent to Chicago, on the Des Plaines River; inc. 1873. It is chiefly residential. Several national and international corporations ha...

contour

(Encyclopedia)contour or contour line, line on a topographic map connecting points of equal elevation above or below mean sea level. It is thus a kind of isopleth, or line of equal quantity. Contour lines are drawn...

geodesy

(Encyclopedia)geodesy jēŏdˈĭsē [key] or geodetic surveying, theory and practice of determining the position of points on the earth's surface and the dimensions of areas so large that the curvature of the earth...

aurora borealis

(Encyclopedia)aurora borealis ôstrāˈlĭs [key], luminous display of various forms and colors seen in the night sky. The aurora borealis of the Northern Hemisphere is often called the northern lights, and the aur...

Mogadishu

(Encyclopedia)Mogadishu or Mogadisho both: mŏgədĭshˈo͞o [key], Ital. Mogadiscio, city (1990 est. pop. 1,200,000), capital of Somalia, on the Indian Ocean. It is the country's largest city, a port, and a commer...

krypton

(Encyclopedia)krypton krĭpˈtŏn [key] [Gr.,=hidden], gaseous chemical element; symbol Kr; at. no. 36; at. wt. 83.798; m.p. −156.6℃; b.p. −152.3℃; density 3.73 grams per liter at STP; valence usually 0. Kr...

Trans-Dniester Region

(Encyclopedia)Trans-Dniester Region or Transnistria, region (2004 preliminary pop. 555,000), E Moldova, between the Dniester River and the Ukrainian border. A narrow territory some 120 mi (195 km) long but barely 2...

Neariah

(Encyclopedia)Neariah nēˌərīˈə [key], in the Bible. 1 One of David's line. 2 Son of Ishi, a Simeonite captain. ...

SOS

(Encyclopedia)SOS, code letters of the international distress signal. The signal is expressed in International Morse code as … — — — ……———… (three dots, three dashes, three dots). This c...