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TROPICAL SOLAR CALENDARS If the position of the earth (or the sun) is reckoned with respect to the Equinox , then the dates indicate the Season (and so is synchronized to the Declination of the Sun ). 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:
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 . SIDEREAL 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 and Bengali Calendar are a sidereal solar calendars. They are usually 365 days long, but now and then take an extra day to make a Leap Year . NON-SOLAR CALENDARS 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 Rising s of stars. LUNISOLAR CALENDARS Lunisolar Calendar s may be regarded as solar calendars, although their dates additionally indicate the Moon Phase . Because a typical lunisolar calendar has a year made up of a whole number of lunar months, it can't indicate it position of Earth on its revolution around the sun as well as a pure solar calendar can. SEE ALSO |
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