User:Boyd8420/sandbox

Articles to edit for Wikipedia Project 2013.Boyd8420 (talk) 03:40, 21 May 2013 (UTC)

Cleostatus
wiki project choice. three sources. attach class to Cleostratus.

Jews in Islamic Medieval context
An article about the Jewish Phiolsopher Maimonides in a context to show cooperation between Islamic and Jewish intellectuals. An important issue especially given heightened idelogy concerning Christian/Greek transmission and the idea of a lack of Islamic progress or fresh/new thoughts in their respected Golden era of learning. There continues to be a competition between these religions for science and domination in the historical accounts invovling progress.Boyd8420 (talk) 04:14, 23 May 2013 (UTC)


 * The main use of cycles was to try to find some commensurable basis for lunar and solar calendars, and the best known of all the early attempts was the octaëteris, usually attributed to Cleostratus of Tenedos (c. 500 bce) and Eudoxus of Cnidus (390–c. 340 bce). The cycle covered eight years, as its name implies, and so the octaëteris amounted to 8 × 365, or 2,920 days. This was very close to the total of 99 lunations (99 × 29.5 = 2,920.5 days), so this cycle gave a worthwhile link between lunar and solar calendars. When in the 4th century bce the accepted length of the year became 365.25 days, the total number of solar calendar days involved became 2,922, and it was then realized that the octaëteris was not as satisfactory a cycle as supposed.


 * Another early and important cycle was the saros, essentially an eclipse cycle. There has been some confusion over its precise nature because the name is derived from the Babylonian word shār or shāru, which could mean either “universe” or the number 3,600 (i.e., 60 × 60). In the latter sense it was used by Berosus (c. 290 bce) and a few later authors to refer to a period of 3,600 years. What is now known as the saros and appears as such in astronomical textbooks (still usually credited to the Babylonians) is a period of 18 years 11 1/3 days (or with one day more or less, depending on how many leap years are involved), after which a series of eclipses is repeated.