[Aztlan] precession

[sharon mcmullen orlet]

Dear Listera, (with no "n")

I am trying to understand an inch more about the Maya calendar and precession.   So ... a complete precession comes about Dec 21st 2012 AD from  25,800 years before.

(it could be that any date is 25,800 years later, but this date is also ....

?the time when we are in the "middlest" of the milky way?)

Does the Maya calendar "know", reflect,  precession and if it does, how do you think they were able to apprehend it?

I'd be glad to be pointed to older emails....



"The Earth goes through one complete precession cycle in a period of approximately 25,800 years, during which the positions of stars as measured in the equatorial coordinate system will slowly change; the change is actually due to the change of the coordinates. Over this cycle the Earth's north axial pole moves from where it is now, within 1° of Polaris, in a circle around the ecliptic pole, with an angular radius of about 23.5 degrees (or approximately 23 degrees 27 arcminutes [1]). The shift is 1 degree in 180 years, where the angle is taken from the observer, not from the center of the circle.

Discovery of the precession of the equinoxes is generally attributed to the ancient Greek astronomer Hipparchus (ca. 150 B.C.), though the difference between the sidereal and tropical years was known to Aristarchus of Samos much earlier (ca. 280 B.C.). It was later explained by Newtonian physics. The Earth has a nonspherical shape, being oblate spheroid, bulging outward at the equator. The gravitational tidal forces of the Moon and Sun apply torque as they attempt to pull the equatorial bulge into the plane of the ecliptic. "

thanks,

sharon mcmullen orlet
ojuliana at sbcglobal.net
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