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| | Calendars |
 | | For a lunar calendar adjusting to the solar year, the best approximations (by continued fractions) to the difference between twelve synodic months and the tropical year would be to add one month every three years, three every eight, four every eleven, seven every nineteen, or 123 every 334. |
 | | Surviving luni-solar calendars, the Jewish and the Chinese, are now used mainly for ritual purposes. |
 | | While the religious Islâmic calendar is of course used in Irân, the ancient solar calendar also continues to be used as a civil calendar. |
| www.friesian.com /calendar.htm (8375 words) |
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