equant
11Astronomie arabe — Miniature ottomane de l étude de la lune et des étoiles XVIIe siècle Dans l’histoire de l astronomie, l’astronomie arabe renvoie aux découvertes astronomiques accomplies par la civilisation islamique, particulièrement au cours de l’Âge d or… …
12Эквант — (жирная точка); ниже его  центр деферента (крестик) и Земля Эквант (лат. punctum aequans, от лат …
13Cosmology in medieval Islam — Islamic cosmology refers to cosmology in Islamic societies. It is mainly derived from the Qur an, Hadith, Sunnah, and current Islamic as well as other pre Islamic sources. The Qur an itself mentions seven heavens[1] and a vast universe sustained… …
14Science and mathematics from the Renaissance to Descartes — George Molland Early in the nineteenth century John Playfair wrote for the Encyclopaedia Britannica a long article entitled ‘Dissertation; exhibiting a General View of the Progress of Mathematics and Physical Science, since the Revival of Letters …
15Geocentric model — In astronomy, the geocentric model of the universe is the superseded theory that the Earth is the center of the universe and other objects go around it. Belief in this system was common in ancient Greece. It was embraced by both Aristotle and… …
16Maragheh observatory — (Persian:رصدخانه مراغه) is an astronomical observatory which was established in 1259 CE by Nasir al Din al Tusi, an Iranian scientist and astronomer. Located in the heights west of Maragheh, East Azarbaijan province, Iran, it was once considered… …
17Deferent and epicycle — Deferent redirects here. For the acknowledgement of the legitimacy of the power of one s superior or superiors, see Deference. The basic elements of Ptolemaic astronomy, showing a planet on an epicycle (smaller dashed circle) , a deferent (larger …
18Ptolemaic System — (Source: [http://en.wikipedia.org/wiki/Geocentric model| Geocentric Model] )In the Ptolemaic system, each planet is moved by five or more spheres: one sphere is its deferent. The deferent was a circle centered around a point halfway between the …
19Celestial mechanics — is the branch of astrophysics that deals with the motions of celestial objects. The field applies principles of physics, historically classical mechanics, to astronomical objects such as stars and planets to produce ephemeris data. Orbital… …
20Timeline of Islamic science and engineering — This timeline of Islamic science and engineering covers the general development of science and technology in the Islamic world during the Islamic Golden Age, usually dated from the 7th to 16th centuries.From the 17th century onwards, the advances …
