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------- Additional comments from [EMAIL PROTECTED] Fri Feb 11 05:07:52 -0800 2005 ------- Found a good explanation about the 1 day error in Hijri date calculation, taken from http://bennyhills.fortunecity.com/elfman/454/calindex.html#Error 1. The Same Gregorian date may have actually 2-4 Hijri equivalent dates according to the PLACE & TIME of the day. The 1st of Ramadan in Jordan for example could be the 30th of Shaban in some other parts of the world according to the sighting of the moon, also 1st of Ramada at an instance in San Francisco could be equivalent to the 2nd of Ramadan in China because of time zone difference. To add on top that, the Isalmic & Hebrew days begin at sunset, so the 1st of August before sunset & after sunset will correspond to 2 different Islamic & Hebrew days. 2. The conversion from & to the Hijri calendar is a pure mathematical one, & for the reasons of conversion, I had to make the Islamic day start at midnight. This is not true, but it makes conversion easier & wouldn't affect the +/-1 day error that much. In reality, the sighting of the moon is the basis of determining when the month starts. Islamic Astronomers have a fixed 30 year cycle which has the 2nd, 5th, 7th, 10th, 13th, 16th, 18th, 21st, 24th, 26th, and 29th years as leap years of 355 days, this however is not taken into consideration by many Islamic countries which consider the physical sighting of the moon as the only method of determining the beginning of a lunar month. You have to remember also that the Islamic day starts at sunset & ends on the next sunset ! But come now !!! Even with all of these errors, the total error is +/- 1 day, & even the most accurate of calculations will have the same error at the end(look at the paragraph above) !! That makes my converter reliable, especially if you knew that the method of determining the 1st day changes from one country to another, bringing any converter to making predictions, not more ! 3. The Gregorian calendar was implemented in 1582 CE in ROME, so dates before May, 1582 CE are calculated in reference to the first day the Gregorian calendar was implemented "Gregorian Proleptic Calendar." 4. Many countries adopted the Gregorian Calendar years after that date. So you see, some of the errors are out of my hand & some can be corrected! (see below). The transition between calendars gave the people the sense of losing days, although when referring to the proper calendar, not a single day was missed, but the problem was that no one referred to the proper calendar. 5. One way to be 100% sure about the Hijri conversion is to know FOR SURE the day of the week on which a certain Hijri date occurred, then you can correct the Gregorian day result to that day of the week (That is if the results didn't match ??!!), & remember to correct to the nearest day or then you will FOR SURE be 7 days off your mark. --------------------------------------------------------------------- Please do not reply to this automatically generated notification from Issue Tracker. Please log onto the website and enter your comments. http://qa.openoffice.org/issue_handling/project_issues.html#notification --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
