The calendar of Uposatha days is calculated using a complex traditional formula that is loosely based on the lunar calendar, with the result that the dates do not always coincide with the actual astronomical dates. To further complicate matters, each sect within Theravada Buddhism tends to follow a slightly different calendar.
Monkey Mind wrote:The calendar of Uposatha days is calculated using a complex traditional formula that is loosely based on the lunar calendar, with the result that the dates do not always coincide with the actual astronomical dates. To further complicate matters, each sect within Theravada Buddhism tends to follow a slightly different calendar.
Because local Sanghas do not observe Uposatha or have traditions for this, I have been doing this on my own. Is it important to observe the date identified on the calendar, or to observe the actual moon phase date. For example, the quarter moon was Tuesday, but the calendar identifies THursday as the day of observance.
Manapa wrote: but the observance is worked out according to a special calculation I believe so that is why it is sometimes different.


Khalil Bodhi wrote: Here are this year's dates:
http://www.accesstoinsight.org/ptf/dhamma/sila/uposatha2010.html
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