Islamic calendars::Intercalation (timekeeping)


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Islamic calendars The tabular Islamic calendar usually has 12 lunar months that alternate between 30 and 29 days every year, but an intercalary day is added to the last month of the year 11 times within a 30-year cycle. Some historians also linked the pre-Islamic practice of Nasi' to intercalation.

The Hijri-Shamsi calendar is based on solar calculations and is similar to the Gregorian calendar in its structure, and hence the intercalation, with the exception that the calendar starts with Hijra.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Intercalation (timekeeping) sections
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Islamic calendars
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