(Encyclopedia) Ptolemaic systemPtolemaic systemtŏlˌəmāˈĭk [key], historically the most influential of the geocentric cosmological theories, i.e., theories that placed the earth motionless at the…
(Encyclopedia) calendar [Lat., from Kalends], system of reckoning time for the practical purpose of recording past events and calculating dates for future plans. The calendar is based on noting…
(Encyclopedia) Lively, Dame Penelope, 1933–, English novelist, b. Cairo, Egypt, moved to London at 12 when her parents divorced, grad. Oxford (1954). Her earliest books were children's novels—the…
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Apsis points, or apsides, in the earth's orbit: At perihelion the earth is closest to the sun and at aphelion it is farthest from the sun.
apsis (pl. apsides), point in the…
(Encyclopedia) PrometheusPrometheusprōmēˈthēəs [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn XVI (or S16), Prometheus is an irregularly shaped (…
(Encyclopedia) Verne, JulesVerne, Julesvûrn; zhül vĕrn [key], 1828–1905, French novelist, originator of modern science fiction. After completing his studies at the Nantes lycée, he went to Paris to…
(Encyclopedia) space law, agreements governing the exploration and use of outer space, developed since the first launching (1957) by humans of a satellite into space. Space law, an aspect of…
(Encyclopedia) Laplace, Pierre Simon, marquis deLaplace, Pierre Simon, marquis depyĕr sēmôNˈ märkēˈ də läpläsˈ [key], 1749–1827, French astronomer and mathematician. At 18 he went to Paris, proved…
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