Solar calendar
- Solar calendar
A solar calendar is a
calendar whose dates indicate the position of the earth on its revolution around thesun (or equivalently the apparent position of the sun moving on thecelestial sphere ).Tropical solar calendars
If the position of the earth (or the sun) is reckoned with respect to the
equinox , then the dates indicate theseason (and so is synchronized to thedeclination of thesun ). Such a calendar is called a tropical solar calendar.The mean calendar year of such a calendar approximates some form of the
tropical year (typically either the mean tropical year or the vernal equinox year).The following are tropical solar calendars:
*Gregorian calendar
*Julian calendar
*Bahá'í calendar
*Coptic calendar
*Iranian calendar (Jalāli Calendar)
*Malayalam calendar
*Tamil calendar
*Thai solar calendar 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 .idereal solar calendars
If the position of the earth (see above) is reckoned with respect to the fixed stars, then the dates indicate the
zodiacal constellation near which the sun can be found. Such a calendar is called a sidereal solar calendar.The mean calendar year of such a calendar approximates the
sidereal year .The
Hindu calendar andBengali calendar are sidereal solar calendars. They are usually 365 days long, but now and then take an extra day to make aleap year .Non-solar calendars
Calendars that are "not" solar calendars, include the
Islamic calendar which is a purelylunar calendar and calendars synchronized to thesynodic period of Venus or to theheliacal rising s of stars.Lunisolar calendars
Lunisolar calendar s may be regarded as solar calendars, although their dates additionally indicate themoon phase . Because a typical lunisolar calendar has a year made up of a whole number of lunar months, it can't indicate the position of Earth on its revolution around the sun as well as a pure solar calendar can.ee also
*
Analemma calendar
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