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- First_Point_of_Aries abstract "The First Point of Aries is the location of the vernal equinox, and is named for the constellation of Aries. It is one of the two points on the celestial sphere at which the celestial equator meets the ecliptic plane, the other being the First Point of Libra, located exactly 180° from it. Over its year-long journey through the constellations, the Sun crosses the celestial equator from south to north at the First Point of Aries, and from north to south at the First Point of Libra. The First Point of Aries is considered to be the celestial \"prime meridian\" from which right ascensions are calculated.The First Point of Aries (also known as the Cusp of Aries) is so called because, when Hipparchus defined it in 130 BCE, it was located in the western extreme of the constellation of Aries, near its border with Pisces and the star γ Arietis. Due to the Sun's eastward movement across the sky throughout the year, this western end of Aries was the point at which the Sun entered the constellation, hence the name First Point of Aries.Due to Earth's axial precession, this point gradually moves westwards at a rate of about one degree every 72 years. This means that, since the time of Hipparchus, it has shifted across the sky by about 30°, and is currently located within Pisces, near its border with Aquarius. Currently, the closest major star to the First Point of Aries is λ Piscium, located at (22h 52m 37s, −07° 34′ 47″).The Sun now appears in Aries from late April through mid May, though the constellation is still associated with the beginning of spring.The Cusp of Aries is important to the fields of astronomy, nautical navigation and astrology. Navigational ephemeris tables record the geographic position of the First Point of Aries as the reference for position of navigational stars. Due to the precession of the equinoxes, the astrological signs of the tropical zodiac are likewise identically affected and thus also no longer correspond with the actual constellations once ascribed to them (with the Cusp of Libra now actually located within Virgo), and is the basis for the concept of astrological ages. In sidereal astrology (notably Hindu astrology), by contrast, the first point of Aries remains aligned with Ras Hammel \"the head of the ram\", i.e. the Aries constellation.".
- First_Point_of_Aries thumbnail Constellations_ecliptic_equirectangular_plot.svg?width=300.
- First_Point_of_Aries wikiPageExternalLink aries.htm.
- First_Point_of_Aries wikiPageID "153774".
- First_Point_of_Aries wikiPageLength "3953".
- First_Point_of_Aries wikiPageOutDegree "38".
- First_Point_of_Aries wikiPageRevisionID "680078714".
- First_Point_of_Aries wikiPageWikiLink Aquarius_(constellation).
- First_Point_of_Aries wikiPageWikiLink Aries_(constellation).
- First_Point_of_Aries wikiPageWikiLink Astrological_age.
- First_Point_of_Aries wikiPageWikiLink Astrological_sign.
- First_Point_of_Aries wikiPageWikiLink Axial_precession.
- First_Point_of_Aries wikiPageWikiLink Category:Astronomy.
- First_Point_of_Aries wikiPageWikiLink Category:Celestial_coordinate_system.
- First_Point_of_Aries wikiPageWikiLink Category:Constellations.
- First_Point_of_Aries wikiPageWikiLink Category:Dynamics_of_the_Solar_System.
- First_Point_of_Aries wikiPageWikiLink Category:Technical_factors_of_astrology.
- First_Point_of_Aries wikiPageWikiLink Category:Time_in_astronomy.
- First_Point_of_Aries wikiPageWikiLink Celestial_coordinate_system.
- First_Point_of_Aries wikiPageWikiLink Celestial_equator.
- First_Point_of_Aries wikiPageWikiLink Celestial_sphere.
- First_Point_of_Aries wikiPageWikiLink Constellation.
- First_Point_of_Aries wikiPageWikiLink Ecliptic.
- First_Point_of_Aries wikiPageWikiLink Equinox.
- First_Point_of_Aries wikiPageWikiLink Equinox_(celestial_coordinates).
- First_Point_of_Aries wikiPageWikiLink Gamma_Arietis.
- First_Point_of_Aries wikiPageWikiLink Hamal.
- First_Point_of_Aries wikiPageWikiLink Hindu_astrology.
- First_Point_of_Aries wikiPageWikiLink Hipparchus.
- First_Point_of_Aries wikiPageWikiLink Lambda_Piscium.
- First_Point_of_Aries wikiPageWikiLink March_equinox.
- First_Point_of_Aries wikiPageWikiLink Nautical_almanac.
- First_Point_of_Aries wikiPageWikiLink Pisces_(constellation).
- First_Point_of_Aries wikiPageWikiLink Precession.
- First_Point_of_Aries wikiPageWikiLink Prime_meridian.
- First_Point_of_Aries wikiPageWikiLink Right_ascension.
- First_Point_of_Aries wikiPageWikiLink Sidereal_and_tropical_astrology.
- First_Point_of_Aries wikiPageWikiLink Sun.
- First_Point_of_Aries wikiPageWikiLink Virgo_(constellation).
- First_Point_of_Aries wikiPageWikiLink Zodiac.
- First_Point_of_Aries wikiPageWikiLink File:Constellations_ecliptic_equirectangular_plot.svg.
- First_Point_of_Aries wikiPageWikiLinkText "First Point of Aries".
- First_Point_of_Aries wikiPageWikiLinkText "First Point".
- First_Point_of_Aries wikiPageWikiLinkText "first point of Aries".
- First_Point_of_Aries wikiPageWikiLinkText "sun passes into the constellation Aries".
- First_Point_of_Aries wikiPageUsesTemplate Template:Cite_book.
- First_Point_of_Aries wikiPageUsesTemplate Template:Cite_web.
- First_Point_of_Aries wikiPageUsesTemplate Template:DEC.
- First_Point_of_Aries wikiPageUsesTemplate Template:RA.
- First_Point_of_Aries wikiPageUsesTemplate Template:Reflist.
- First_Point_of_Aries wikiPageUsesTemplate Template:Sfn.
- First_Point_of_Aries wikiPageUsesTemplate Template:SfnRef.
- First_Point_of_Aries subject Category:Astronomy.
- First_Point_of_Aries subject Category:Celestial_coordinate_system.
- First_Point_of_Aries subject Category:Constellations.
- First_Point_of_Aries subject Category:Dynamics_of_the_Solar_System.
- First_Point_of_Aries subject Category:Technical_factors_of_astrology.
- First_Point_of_Aries subject Category:Time_in_astronomy.
- First_Point_of_Aries hypernym Location.
- First_Point_of_Aries type Place.
- First_Point_of_Aries comment "The First Point of Aries is the location of the vernal equinox, and is named for the constellation of Aries. It is one of the two points on the celestial sphere at which the celestial equator meets the ecliptic plane, the other being the First Point of Libra, located exactly 180° from it. Over its year-long journey through the constellations, the Sun crosses the celestial equator from south to north at the First Point of Aries, and from north to south at the First Point of Libra.".
- First_Point_of_Aries label "First Point of Aries".
- First_Point_of_Aries sameAs Q80360.
- First_Point_of_Aries sameAs Lentepunt.
- First_Point_of_Aries sameAs نقطة_الربيع_(فلك).
- First_Point_of_Aries sameAs Puntu_Aries.
- First_Point_of_Aries sameAs Punt_dxc3x80ries.
- First_Point_of_Aries sameAs Jarní_bod.
- First_Point_of_Aries sameAs Forårspunktet.
- First_Point_of_Aries sameAs Frühlingspunkt.
- First_Point_of_Aries sameAs Verna_punkto.
- First_Point_of_Aries sameAs Punto_Aries.
- First_Point_of_Aries sameAs Aries_Puntua.
- First_Point_of_Aries sameAs Point_vernal.
- First_Point_of_Aries sameAs Proljetna_točka.
- First_Point_of_Aries sameAs Punto_vernale.
- First_Point_of_Aries sameAs 春分点.
- First_Point_of_Aries sameAs Fréijoerspunkt.
- First_Point_of_Aries sameAs Lentepunt.
- First_Point_of_Aries sameAs Punkt_Barana.
- First_Point_of_Aries sameAs Ponto_vernal.
- First_Point_of_Aries sameAs m.0105mfhw.
- First_Point_of_Aries sameAs Proljetna_točka.
- First_Point_of_Aries sameAs Pomladišče.
- First_Point_of_Aries sameAs Гама_тачка.
- First_Point_of_Aries sameAs Q80360.
- First_Point_of_Aries sameAs 春分点.
- First_Point_of_Aries wasDerivedFrom First_Point_of_Aries?oldid=680078714.
- First_Point_of_Aries depiction Constellations_ecliptic_equirectangular_plot.svg.
- First_Point_of_Aries isPrimaryTopicOf First_Point_of_Aries.