celestial bodies
101Retrograde motion — This article is about retrograde motions of celestial bodies relative to a gravitationally central object. For the apparent motion as seen from a particular vantage point, see Apparent retrograde motion. Retrograde orbit: the satellite (red)… …
102List of rasa'il in the Encyclopedia of the Brethren of Purity — The following is a list of the rasa il (epistles) which compose the influential Neoplatonic encyclopedia, the Encyclopedia of the Brethren of Purity composed by the Brethren of Purity in the tenth century CE in Basra, Iraq.The following… …
103Islamic astrology — This is a sub article of History of science in the Islamic World and Astrology. Islamic astrology, in Arabic ilm al nujum or ilm al falak , is the study of the heavens by early Muslims. In early Arabic sources, ilm al nujum was used to refer to… …
104Astronomical chronology — Astronomical chronology, or astronomical dating, is a technical method of dating events or artifacts that are associated with astronomical phenomena. Written records of historical events that include descriptions of astronomical phenomena have… …
105astronomical map — Introduction any cartographic representation of the stars, galaxies, or surfaces of the planets and the Moon. Modern maps of this kind are based on a coordinate system analagous to geographic latitude and longitude. In most cases, modern… …
106Navigation — This article is about determination of position and direction on or above the surface of the earth. For other uses, see Navigation (disambiguation). Table of geography, hydrography, and navigation, from the 1728 Cyclopaedia. Navigation is the… …
107Specific orbital energy — In the gravitational two body problem, the specific orbital energy (or vis viva energy) of two orbiting bodies is the constant sum of their mutual potential energy ( ) and their total kinetic energy ( ), divided by the reduced mass. According to… …
108Cleomedes — This article concerns the Greek astronomer. For the article on the lunar crater named for him, see Cleomedes (crater). Cleomedes (Κλεoμήδης) was a Greek astronomer who is known chiefly for his book On the Circular Motions of the Celestial Bodies …
109Theory of impetus — The theory of impetus was an antiquated auxiliary or secondary theory of Aristotelian dynamics, put forth initially to explain projectile motion against gravity. It was first introduced by Hipparchus in antiquity, and subsequently further… …
110Cinturón de asteroides — Imagen esquemática del cinturón de asteroides. Se muestra el cinturón principal, entre las órbitas de Marte y Júpiter, y el grupo de los troyanos, en la órbita de Júpiter …
