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User talk:PW. Jansen: Difference between revisions
→Leap year: additional remark about calendars, I found a good document dealing with this.
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Traditionally the Arab added a month every so many years to synchronize sun and moon calendar. This a rather coarse way but sun and moon calendar don't get out of synch completely like is the case now. see: http://islam.about.com/cs/calendar/a/hijrah_calendar.htm for the current one. For the older one e.g. http://www.jstor.org/discover/10.2307/20837003?uid=3737536&uid=2&uid=4&sid=21104072781421 (PW. Jansen) | Traditionally the Arab added a month every so many years to synchronize sun and moon calendar. This a rather coarse way but sun and moon calendar don't get out of synch completely like is the case now. see: http://islam.about.com/cs/calendar/a/hijrah_calendar.htm for the current one. For the older one e.g. http://www.jstor.org/discover/10.2307/20837003?uid=3737536&uid=2&uid=4&sid=21104072781421 (PW. Jansen) | ||
:I read the link. So the old Arab calendar was replaced by a strict lunar calendar hence there is shortfall of 10 or 11 days from the 365-day year. Now can you clarify the error you found? Are you saying that a leap year situation should have been considered? And when, while creating this lunar calendar? [[User:Saggy|Saggy]] ([[User talk:Saggy|talk]]) 02:39, 21 August 2014 (PDT) | :I read the link. So the old Arab calendar was replaced by a strict lunar calendar hence there is shortfall of 10 or 11 days from the 365-day year. Now can you clarify the error you found? Are you saying that a leap year situation should have been considered? And when, while creating this lunar calendar? [[User:Saggy|Saggy]] ([[User talk:Saggy|talk]]) 02:39, 21 August 2014 (PDT) | ||
Hi, My point is that Muhammad does not understand what it is for, and now the Muslims have to use two calendars, one for Ramadan (the lunar calendar imposed by Muhammad) and one for agriculture ( the solar calendar). | |||
Quote from PDF:Calendars are basically of two types: lunar or non-lunar. Lunar calendars have months based on the cycle of the phases of the moon (the synodic month, ca. 29.53 days). Twelve lunar months will total an average of about 354 days and are thus roughly 11 days shorter than the true solar (tropical or sidereal) year of 365.2422 days. Most of the nations of the ancient world used lunisolar calendars, where the difference between the lunar and the solar year is compensated by periodically intercalating a thirteenth month. Non-lunar calendars are based on notional "months" with a fixed number of days and make no attempt to keep pace with the phases of the moon. | |||
Link: https://cmes.uchicago.edu/sites/cmes.uchicago.edu/files/uploads/Middle%20Eastern%20Calendars.pdf | |||
== "Pray to Muhammad" == | == "Pray to Muhammad" == | ||