sublunary
71Spherical Earth — Medieval artistic representation of a spherical Earth with compartments representing earth, air, and water (c. 1400). The concept of a spherical Earth dates back to ancient Greek philosophy from around the 6th century BC …
72Timocharis — of Alexandria (ca. 320 BC – 260 BC) was a Greek astronomer and philosopher. Likely born in Alexandria, he was a contemporary of Euclid.[citation needed] What little is known about Timocharis comes from citations by Ptolemy in the Almagest. These… …
73Heliocentrism — Heliocentric redirects here. For the albums, see Heliocentric (Paul Weller album) and Heliocentric (The Ocean Collective album). Heliocentric Universe …
74Apollonius of Perga — Apollonius of Perga. Apollonius of Perga [Pergaeus] (Ancient Greek: Ἀπολλώνιος) (ca. 262 BC – ca. 190 BC) was a Greek geometer and astronomer noted for his writings on conic sections. His innovative methodology and terminology, especially in the… …
75Abd al-Rahman al-Sufi — Azophi redirects here. For the lunar crater, see Azophi (crater). Abd al Rahman al Sufi (Persian: عبدالرحمن صوفی) (December 7, 903 – May 25, 986) was a Persian astronomer also known as Abd ar Rahman as Sufi, or Abd al Rahman Abu al Husayn, Abdul… …
76Obadiah ben Jacob Sforno — For the article elaborating on the many members of the Sforno family, see Sforno (family). Obadiah ben Jacob Sforno (Obadja Sforno, Hebrew: עובדיה ספורנו) was an Italian rabbi, Biblical commentator, philosopher and physician. He was born at… …
77Celestial spheres — Not to be confused with celestial sphere. For other uses, see Celestial (disambiguation). Geocentric celestial spheres; Peter Apian s Cosmographia (Antwerp, 1539) …
78Abū Ishāq Ibrāhīm al-Zarqālī — Arzachel redirects here. For other uses, see Arzachel (disambiguation). Abū Isḥāq Ibrāhīm ibn Yaḥyā al Naqqāsh al Zarqālī, Al Zarqali, Ibn Zarqala (1029–1087), Latinized as Arzachel, was an instrument maker and one of the leading theoretical and… …
79Octaeteris — In astronomy, an octaeteris (plural: octaeterides) is the period of eight solar years after which the moon phase occurs on the same day of the year plus one or two days. This period is also in a very good synchronicity with five Venusian… …
80The Guide for the Perplexed — This article is about the 12th century book by Maimonides. For the 1977 book by E.F. Schumacher, see A Guide for the Perplexed. For the 2001 novel by Gilad Atzmon, see A Guide to the Perplexed. The title page of The Guide for the Perplexed The… …
