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Solar calendar

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	Solar calendar
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	Topics Solar calendar Topic Home A solar calendar is a calendarCalendar A calendar is a system for naming periods of time, typically days.... whose dates indicate the position of the earth on its revolution around the sunFacts About Sun \|+ The Sun \|+\|-\| colspan="2" align="center" \| \|-... (or equivalently the apparent position of the sun moving on the celestial sphereCelestial sphere In astronomy and navigation, the celestial sphere is an imaginary rotating sphere of "gigantic radius", concentric and coaxi... ). Tropical solar calendars If the position of the earth (or the sun) is reckoned with respect to the equinoxEquinox An equinox in astronomy is the moment when the Sun can be observed to be directly above the equator.... , then the dates indicate the seasonSeason A season is one of the major divisions of the year, generally based on yearly periodic changes in weather.... (and so is synchronized to the declinationDeclination In astronomy, declination is one of the two coordinates of the equatorial coordinate system, the other being either right a... of the sunSun \|+ The Sun \|+\|-\| colspan="2" align="center" \| \|-... ). Such a calendar is called a tropical solar calendar. The mean calendar year of such a calendar approximates some form of the tropical yearTropical year A tropical year is the length of time that the Sun, as viewed from the Earth, takes to return to the same position along the... (typically either the mean tropical year or the vernal equinox year). The following are tropical solar calendars: Gregorian calendarGregorian calendar The Gregorian calendar is the calendar that is used nearly everywhere in the world.... Julian calendarJulian calendar The Julian calendar was introduced in 46 BC by Julius Caesar and took force in 45 BC .... Bahá'í calendarBahá'í calendar The Bah' calendar, also called the Bad calendar, common to the Bah' Faith, is a solar calendar with regular years of 3... Coptic calendarCoptic calendar The Coptic calendar, also called the Alexandrian calendar, is used by the Coptic Orthodox Church.... Iranian calendarIranian calendar The Iranian calendar is a solar calendar currently used in Iran and Afghanistan.... (Jalali Calendar) Malayalam calendarMalayalam calendar Malayalam calendar is a solar Sideral calendar used in the the state of Kerala in South India.... Tamil calendarTamil calendar The Tamil Calendar is followed by the Tamil speaking state of Tamil Nadu in India and Sri Lanka.... Thai solar calendarThai solar calendar The Suriyakati or Thai solar calendar is the official and prevalent calendar in Thailand, although the Western calenda... Every one of these calendars has a year of 365 days, which is occasionally extended by adding an extra day to form a leap yearLeap year A leap year is a year containing an extra day, week or month in order to keep the calendar year synchronised with the astro... . 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 constellationZodiacal constellation The astrological zodiacal constellations are twelve in number.... 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 yearSidereal year The sidereal year is the time for the Sun to return to the same position in respect to the stars of the celestial sphere.... . The Hindu calendarHindu calendar The Hindu calendar used in ancient Vedic times has undergone many changes in the process of regionalization, and today there... and Bengali calendarBengali calendar The Bengali calendar or Bangla calendar is a traditional solar calendar used in Bangladesh and India's eastern states of We... are sidereal solar calendars. They are usually 365 days long, but now and then take an extra day to make a leap yearLeap year A leap year is a year containing an extra day, week or month in order to keep the calendar year synchronised with the astro... . Non-solar calendars Calendars that are not solar calendars, include the Islamic calendarFacts About Islamic calendar The Islamic calendar or Muslim calendar is the calendar used to date events in many predominantly Muslim countries, a... which is a purely lunar calendarLunar calendar A lunar calendar is a calendar whose date indicates the moon phase.... and calendars synchronized to the synodic period of Venus or to the heliacal risingHeliacal rising The heliacal rising of a star occurs when it first becomes visible above the eastern horizon at dawn, after a period when it... s of stars. Lunisolar calendars Lunisolar calendarLunisolar calendar A lunisolar calendar is a calendar whose date indicates both the moon phase and the time of the solar year.... s may be regarded as solar calendars, although their dates additionally indicate the moon phaseMoon Phase Moon Phase or moon phase can refer to:Lunar 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. See also Analemma calendarAnalemma calendar Overview Analemma calendars* are a common feature at science museums and planetariums....