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- Great_Year abstract "The term Great Year has a variety of related meanings. It is defined by NASA as \"The period of one complete cycle of the equinoxes around the ecliptic, about 25,800 years […] also known as [a] Platonic Year.\" One complete cycle of the equinoxes here means one complete cycle of axial precession; this precession was known to Plato, who defined the \"perfect year\" as the return of the celestial bodies (planets) and the diurnal rotation of the fixed stars (circle of the Same) to their original positions. Cicero followed Plato in defining the Great Year as a combination of solar, lunar and planetary cycles (61 XX) Nicholas Campion writes of \"periods of History, analogous to the solar year, known as 'Great Years' \" Plato's description of the perfect year is found in his dialogue Timaeus And so people are all but ignorant of the fact that time really is the wanderings of these bodies, bewilderingly numerous as they are and astonishingly variegated. It is none the less possible, however, to discern that the perfect number of time brings to completion the perfect year at that moment when the relative speeds of all eight periods have been completed together and, measured by the circle of the Same that moves uniformly, have achieved their consummation.\"The 'Great Year' as defined by the historian Josephus is 600 years in length. (Book 1, Chapter 3, Paragraph 9)God afforded them a longer time of life on account of their virtue, and the good use they made of it in astronomical and geometrical discoveries, which would not have afforded the time of foretelling [the periods of the stars] unless they had lived six hundred years; for the great year is completed in that interval.In De Natura Deorum, Cicero wroteOn the diverse motions of the planets the mathematicians have based what they call the Great Year,\" which is completed when the sun, moon and five planets having all finished their courses have returned to the same positions relative to one another. The length of this period is hotly debated, but it must necessarily be a fixed and definite time.\" By extension, the term \"Great Year\" can also be used for any concept of eternal return in the world's mythologies or philosophies. Otto Neugebauer wrote\"The difficulty with the term \"great year\" lies in its ambiguity. Almost any period can be found sometime or somewhere honored with this name.\" Macrobius in his commentary on Cicero's Somnium Scipiones states that 'the philosophers' reckon the Great Year as 15,000 years. (p. 97) Censorinus wrote that Aristarchus of Samos reckoned a Great Year of 2484 years: it has been argued that this is a miscopying of 2434, which represents 45 Exeligmos cycles. (p. 96) (p. 6)The Platonic Year in origin would seem to have no connection with this concept (as the precession of the equinox was unknown to Europe in Plato's time). and two centuries after Plato, Hipparchus is credited with discovering the period of equinox precession, and the term \"Great Year\" eventually came to be applied to the period of that precession caused by the slow gyration of the Earth's axis.Some time around the middle of the second century BC, the astronomer Hipparchus discovered that the fixed stars as a whole gradually shifted their position in relation to the annually determined locations of the Sun at the equinoxes and solstices... Otto Neugebauer argued that Hipparchus in fact believed that this [36,000 years] was the maximum figure and that he also computed the true rate of one complete precession cycle at just under 26,000 years...It is argued that the confusion originates with the astronomer Ptolemy, who \"adopted the larger, erroneous, figure, with the result that henceforth the two versions of the Great Year — the Platonic Great Year, defined by the planets, and the precessional, defined by the stars — were to be increasingly confused.\" Ptolemy has been accused of committing scientific fraud by making up observations that would give the figure of 36,000 years even though the data available to him were good enough to get very near the true figure of 26,000.Josephus refers to a 'Great Year' (Ancient Greek: μέγας ἐνιαυτός) of 600 years. (ch.4)God afforded them a longer time of life on account of their virtue, and the good use they made of it in astronomical and geometrical discoveries, which would not have afforded the time of foretelling [the periods of the stars] unless they had lived six hundred years; for the great year is completed in that interval.It has been suggested that he obtained this value from Berossos who reckoned time in intervals of 60, 600 and 3600 years.Isaac Newton determined the cause of precession and established the rate of precession at 1 degree per 72 years, very close to the true value, thus demonstrating the magnitude of the error in the value of 1 degree per century. (letter 17)Walter Cruttenden wrote of the Great YearSome people called it the Yuga cycle, others called it the Grand cycle and others the Perfect Year...But the most common name found in use from ancient Europe to ancient China, was simply the Great Year\".".
- Great_Year wikiPageID "1078755".
- Great_Year wikiPageLength "9114".
- Great_Year wikiPageOutDegree "42".
- Great_Year wikiPageRevisionID "706127029".
- Great_Year wikiPageWikiLink Aristarchus_of_Samos.
- Great_Year wikiPageWikiLink Astrological_age.
- Great_Year wikiPageWikiLink Astronomer.
- Great_Year wikiPageWikiLink Axial_precession.
- Great_Year wikiPageWikiLink Berossus.
- Great_Year wikiPageWikiLink Category:Astrological_ages.
- Great_Year wikiPageWikiLink Category:Astronomical_epochs.
- Great_Year wikiPageWikiLink Category:History_of_astrology.
- Great_Year wikiPageWikiLink Category:History_of_astronomy.
- Great_Year wikiPageWikiLink Category:Precession.
- Great_Year wikiPageWikiLink Censorinus.
- Great_Year wikiPageWikiLink Cicero.
- Great_Year wikiPageWikiLink De_Natura_Deorum.
- Great_Year wikiPageWikiLink Diurnal_motion.
- Great_Year wikiPageWikiLink Ecliptic.
- Great_Year wikiPageWikiLink Equinox.
- Great_Year wikiPageWikiLink Eternal_return.
- Great_Year wikiPageWikiLink Europe.
- Great_Year wikiPageWikiLink Exeligmos.
- Great_Year wikiPageWikiLink Hipparchus.
- Great_Year wikiPageWikiLink Isaac_Newton.
- Great_Year wikiPageWikiLink Josephus.
- Great_Year wikiPageWikiLink Macrobius.
- Great_Year wikiPageWikiLink Mythology.
- Great_Year wikiPageWikiLink NASA.
- Great_Year wikiPageWikiLink Nicholas_Campion.
- Great_Year wikiPageWikiLink Otto_E._Neugebauer.
- Great_Year wikiPageWikiLink Philosophy.
- Great_Year wikiPageWikiLink Planet.
- Great_Year wikiPageWikiLink Plato.
- Great_Year wikiPageWikiLink Precession.
- Great_Year wikiPageWikiLink Ptolemy.
- Great_Year wikiPageWikiLink Somnium_Scipiones.
- Great_Year wikiPageWikiLink Star.
- Great_Year wikiPageWikiLink Timaeus_(dialogue).
- Great_Year wikiPageWikiLink Yuga.
- Great_Year wikiPageWikiLinkText "Etruscan Great Year".
- Great_Year wikiPageWikiLinkText "Great Year or Platonic Year".
- Great_Year wikiPageWikiLinkText "Great Year".
- Great_Year wikiPageWikiLinkText "Platonic Year".
- Great_Year wikiPageUsesTemplate Template:Disputed.
- Great_Year wikiPageUsesTemplate Template:Lang-grc.
- Great_Year wikiPageUsesTemplate Template:Multiple_issues.
- Great_Year wikiPageUsesTemplate Template:Quote.
- Great_Year wikiPageUsesTemplate Template:Reflist.
- Great_Year wikiPageUsesTemplate Template:Sections.
- Great_Year subject Category:Astrological_ages.
- Great_Year subject Category:Astronomical_epochs.
- Great_Year subject Category:History_of_astrology.
- Great_Year subject Category:History_of_astronomy.
- Great_Year subject Category:Precession.
- Great_Year type Factor.
- Great_Year type Redirect.
- Great_Year comment "The term Great Year has a variety of related meanings.".
- Great_Year label "Great Year".
- Great_Year sameAs Q10862179.
- Great_Year sameAs Añu_Platónicu.
- Great_Year sameAs Any_platònic.
- Great_Year sameAs Platónský_rok.
- Great_Year sameAs Weltzyklus.
- Great_Year sameAs Año_platónico.
- Great_Year sameAs Grande_Année.
- Great_Year sameAs שנה_אפלטונית.
- Great_Year sameAs Platonova_godina.
- Great_Year sameAs Anno_platonico.
- Great_Year sameAs 대년.
- Great_Year sameAs Rok_platoński.
- Great_Year sameAs m.0443hp.
- Great_Year sameAs Platonova_godina.
- Great_Year sameAs Platónsky_rok.
- Great_Year sameAs Devinim_yılı.
- Great_Year sameAs Платонівський_рік.
- Great_Year sameAs Q10862179.
- Great_Year sameAs 大年_(歲差年).
- Great_Year wasDerivedFrom Great_Year?oldid=706127029.
- Great_Year isPrimaryTopicOf Great_Year.