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A solar calendar is a calendar whose dates indicate the position of the earth on its revolution around the sun (or equivalently the apparent position of the sun moving on the celestial sphere). Contents 1 Tropical solar calendars 2 Sidereal solar calendars 3 Non-solar calendars 4 Lunisolar calendars 5 See also 6 External links // Tropical solar calendars If the position of the earth in its orbit around the sun is reckoned with respect to the equinox, the point at which the orbit crosses the celestial equator, then its dates accurately indicate the seasons, that is, they are synchronized with the declination of the sun. Such a calendar is called a tropical solar calendar. The duration of the mean calendar year of such a calendar approximates some form of the tropical year, usually either the mean tropical year or the vernal equinox year. The following are tropical solar calendars: Gregorian calendar Julian calendar Bahá'í calendar Hindu 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, a method called "intercalation", the inserted day being "intercalary". The Zoroastrian calendar is a religious calendar used by adherents of the Zoroastrian faith, and is an approximation of the tropical solar calendar. 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 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 purely lunar calendar and calendars synchronized to the synodic period of Venus or to the heliacal risings of stars. Lunisolar calendars Lunisolar calendars 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 the position of Earth on its revolution around the sun as well as a pure solar calendar can. See also Analemma calendar External links Jewish Calendar Correspondence between Hebrew and Islamic calendars, months and holidays (pdf) v • d • e Calendars (list) Wide use Astronomical · Chinese · Gregorian · Hijri · Solar Hijri · ISO Calendar types: Lunar · Lunisolar · Solar Selected use Akan · Armenian · Assyrian · Aztec (Tonalpohualli · Xiuhpohualli) · Babylonian · Bahá'í · Bengali · Berber · Bikram Samwat · Buddhist · Burmese · Byzantine · Celtic · Coptic · Egyptian · Ethiopian · Hebrew · Hellenic · Hindu · Igbo · Inca · Indian · Iranian (Solar Hejri, Persian) · Irish · Japanese · Javanese · Juche · Korean · Kurdish · Lithuanian · Malayalam · Maya (Haab' · Tzolk'in) · Minguo · Nanakshahi · Nepal Sambat · Pawukon · Pentecontad · Rapa Nui · Roman · Tamil · Thai (Lunar · Solar) · Tibetan · Vietnamese · Xhosa · Yoruba Calendar types: Runic · Mesoamerican (Long Count · Calendar round) Christian variants: Calendar of saints · Eastern Orthodox liturgical calendar · Liturgical year · Revised Julian calendar Rarely used Julian Historical French Republican · Germanic · Rumi · Soviet · Swedish · Turkmen Non-Earth Darian Alternative Discordian Displays and applications Economic · Perpetual · Wall v • d • e Time measurement and standards Major subjects Time · Chronometry · Orders of magnitude · Metrology International standards UTC · UTC offset · UT · DUT1 · IERS · ISO 31-1 · ISO 8601 · TAI · 12-hour clock · 24-hour clock · Barycentric Coordinate Time · Civil time · Daylight saving time · Geocentric Coordinate Time · International Date Line · Leap second · Solar time · Terrestrial Time · Time zone Obsolete standards Barycentric Dynamical Time · Ephemeris time · Greenwich Mean Time · Prime Meridian Time in physics Absolute time and space · Spacetime · Chronon · Continuous time · Coordinate time · Cosmological decade · Discrete time · Planck epoch · Planck time · Proper time · Theory of relativity · Time dilation · Gravitational time dilation · Time domain · T-symmetry Horology Clock · Astrarium · Atomic clock · Complication · Equation of time · History of timekeeping devices · Hourglass · Marine chronometer · Marine sandglass · Radio clock · Sundial · Watch · Water clock Calendar Astronomical · Calculating the day of the week · Dominical letter · Epact · Equinox · Gregorian · Intercalation · Islamic · Julian · Leap year · Lunar · Lunisolar · Seven-day week · Solar · Solstice · Tropical year · Week-day names Archaeology & geology Dating methodologies · Geologic time scale · International Commission on Stratigraphy Astronomical chronology Galactic year · Nuclear time scale · Precession · Sidereal time Units of time Century · Day · Decade · Fortnight · Hour · Jiffy · Lustrum · Millennium · Minute · Month · Saeculum · Second · Shake · Tide · Week · Year Related topics Chronology · Duration · Mental chronometry · Metric time · System time · Time value of money · Timekeeper v • d • e Chronology Main articles Time · Astronomy · Geology · Paleontology · Archaeology · History Eras and epochs Calendar eras Ab urbe condita · Anno Domini (Common Era) · Anno Mundi · Byzantine era · Spanish era · Before Present · Hijri · Egyptian · Sothic cycle · Hindu units of measurement · Hindu Yugas Regnal year Canon of Kings · Lists of kings · Limmu · Seleucid era Era names Chinese · Japanese · Korean · Vietnamese Calendars (Pre-)Julian Pre-Julian Roman · Original Julian · Proleptic Julian · Revised Julian Gregorian Gregorian · Proleptic Gregorian · Old Style and New Style dates Astronomical Lunisolar · Solar · Lunar · Astronomical year numbering Others Iranian · Islamic · Chinese sexagenary cycle · ISO week date Astronomic time   Chronology Portal Cosmic Calendar · Ephemeris · Galactic year · Metonic cycle · Milankovitch cycles Geologic time Concepts Deep time · Geological history of Earth · Geological time units Standards Global Standard Stratigraphic Age (GSSA) · Global Boundary Stratotype Section and Point (GSSP) Methods Chronostratigraphy · Geochronology · Isotope geochemistry · Law of superposition · Optical dating · Samarium-neodymium dating Archaeological methods Absolute dating Incremental dating · Archaeomagnetic dating · Dendrochronology · Glottochronology · Ice core · Lichenometry · Paleomagnetism · Radiocarbon dating · Radiometric dating · Tephrochronology · Thermoluminescence dating · Uranium-lead dating Relative dating Seriation · Stratification Genetic methods Amino acid dating · Molecular clock Related topics Chronicle · New Chronology · Periodization · Synchronoptic view · Timeline · Year zero · Circa · Floruit