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Encyclopedia > Great year

A Great year (also known as a Platonic year or Equinoctial cycle) is the time required for one complete cycle of the precession of the equinoxes: about 25700 years. Although astrologers consider it very important, modern day astronomers care little about it. Precession of the equinoxes refers to the precession of the Earths axis of rotation. ... An astrological chart (or horoscope) _ Y2K Chart — This particular chart is calculated for January 1, 2000 at 12:01:00 A.M. Eastern Standard Time in New York City, New York, USA. (Longitude: 074W0023 - Latitude: 40N4251) Astrology (from Greek: αστρολογία = άστρον, astron, star + λόγος, logos, word) is... An astronomer or astrophysicist is a scientist whose area of research is astronomy or astrophysics. ...


Usually in literature one finds the duration given as 26000 years, being a rounding of the supposedly more accurate value of 25800 years. In reality the exact duration cannot be given, as the speed of the general precession is a value changing over time. This speed is currently 50.3 arcseconds per year which would mean 25765 years for one cycle to complete. But speeds of 50.25 arcseconds and 50.34 arcseconds which would lead to the same rounded value of 50.3 arcseconds would result in 25791 and 25744 years respectively. As such the rounded value of 25800 is understandable. A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 ≈ 7. ...


But the precessional speed is currently increasing and as such the period is decreasing. Numerical simulations of the solar system over a period of millions of years give a figure of 257 centuries.[1]


Astrologers do not agree: they just decree that the speed is 50" per year per definition, and then find a period of 25920 years. Boris Cristoff, the Uruguayan astrologer and author of the book in Spanish "El destino de la Humanidad", gives the exact duration as along 25200 years composed of 12 ages of 2100 years each one due, on fact, to the synchronicity of historical events that would prove it.


The great year is also a prominent feature of Mayan astronomy and cosmology. Cycles lasting about 25800 years supposedly marked the time between successive rebirths of the planet (see Maya calendar). The Maya civilization is a historical Mesoamerican civilization, noted for the only known fully developed written language of the pre-Columbian Americas, its spectacular art and monumental architecture, and sophisticated mathematical and astronomical systems. ... // Cosmology, from the Greek: κοσμολογία (cosmologia, κόσμος (cosmos) order + λογια (logia) discourse) is the study of the Universe in its totality, and by extension, humanitys place in it. ... Earth (often referred to as the earth) is the third planet in the solar system in terms of distance from the Sun, and the fifth largest. ... The Maya calendar is actually a system of distinct calendars and almanacs used by the Maya civilization of pre-Columbian Mesoamerica. ...


In the history of astronomy, a great year can refer to any real or imagined cycle with astronomical or astrological significance. The Greeks sometimes called the period of time required for the naked eye planets to realign a great year. It was an important concept in ancient Stoicism. Table of astronomy, from the 1728 Cyclopaedia Astronomy is probably the oldest of the natural sciences, dating back to antiquity, with its origins in the religious practices of pre-history: vestiges of these are still found in astrology, a discipline long interwoven with astronomy, and not completely separate from it... Astrology refers to any of several systems, traditions or beliefs in which knowledge of the apparent positions of celestial bodies and related information is held to be useful in understanding, interpreting and organizing knowledge about personality, human affairs and terrestrial events. ... It has been suggested that Classical Planets be merged into this article or section. ... A restored Stoa in Athens. ...


References

  1. ^ *A.L. Berger; Obliquity & precession for the last 5 million years; Astronomy & astrophysics 51 (1976), 127

See also

Precession of the equinoxes is caused by a polar motion, a change in the orientation of the Earths axis. ... Position of vernal equinox occurring in Pisces after leaving Aries constellation (through the precession of the equinoxes backward motion). ...

External links


  Results from FactBites:
 
Great year - Wikipedia, the free encyclopedia (373 words)
A Great year (also known as a Platonic year or Equinoctial cycle) is the time required for one complete cycle of the precession of the equinoxes: about 25700 years.
This speed is currently 50.3 arcseconds per year which would mean 25765 years for one cycle to complete.
The great year is also a prominent feature of Mayan astronomy and cosmology.
Year - Wikipedia, the free encyclopedia (1920 words)
A seasonal year is the time between successive recurrences of a seasonal event such as the flooding of a river, the migration of a species of bird, the flowering of a species of plant, the first frost, or the first scheduled game of a certain sport.
A tropical year is the time for the Earth to complete one revolution with respect to the framework provided by the intersection of the ecliptic (the plane of the orbit of the Earth) and the plane of the equator (the plane perpendicular to the rotation axis of the Earth).
The draconitic year, eclipse year or ecliptic year is the time for the Sun (as seen from the Earth) to complete one revolution with respect to the same lunar node (a point where the Moon's orbit intersects the ecliptic).
  More results at FactBites »

 
 

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