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Solar calendar

A solar calendar is a calendar whose dates indicate the season and so are synchronized to the declination of the sun. The mean calendar year approximates the tropical year.

The following are solar calendars:

Every one of these calendars has a year of 365 days, which is occasionally extended by adding an extra day to form a leap year.

The following are lunisolar calendars; they have dates that also indicate the moon phase:

Calendars that are not solar calendars, include the Islamic calendar which is a pure lunar calendar and calendars synchronized to the synodic period of Venus or to the heliacal risings of stars.

Last updated: 02-27-2005 12:31:40