(Encyclopedia) altimeteraltimeterăltĭmˈĭtər, ălˈtĭmēˌtər [key], device for measuring altitude. The most common type is an aneroid barometer calibrated to show the drop in atmospheric pressure in…
(Encyclopedia) horizon, in astronomy, roughly circular line bounding an observer's view of the surface of the earth where the sky and earth seem to meet. This is the visible horizon. At sea the…
(Encyclopedia) Hansen, James Edward, 1941–, American astrophysicist and climatologist, b. Denison, Iowa, Ph.D. Univ. of Iowa, 1967. In 1967 he joined the Goddard Institute for Space Studies, and…
(Encyclopedia) scale, in cartography, the ratio of the distance between two points on a map to the real distance between the two corresponding points portrayed. The scale may be expressed in three…
Director Peter Jackson Bringing Middle-earth to the silver screen by Laura Hayes Peter Jackson, a little-known director from New Zealand, has taken on one of the most…
(Encyclopedia) Alpha CentauriAlpha Centauriălˈfə sĕntôrˈē [key], brightest star in the constellation Centaurus and 3d-brightest star in the sky; also known as Rigil Kent or Rigil Kentaurus; 1992…
(Encyclopedia) satellite, natural, celestial body orbiting a planet, dwarf planet, asteroid, or star of a larger size. The most familiar natural satellite is the earth's moon; thus, satellites of…
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Important points in a planet's orbit as seen from the earth
orbit, in astronomy, path in space described by a body revolving about a second body where the motion of the…
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Solar system
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solar system, the sun and the surrounding planets, natural satellites, dwarf planets, asteroids, meteoroids, and comets that are bound by its gravity. The…
Partly to Mostly CloudyWeatherPartly to Mostly CloudyMoisture and HumidityIn the CloudsTen Major Cloud TypesForecasting by Clouds One of the great wonders of the universe is that our planet is…
