Guest guest Posted July 15, 2002 Report Share Posted July 15, 2002 On 15 Jul 2002, at 10:01, shamirashakira wrote: " shamirashakira " <shamira Date sent: Mon, 15 Jul 2002 10:01:05 -0000 Precession Send reply to: > > Oh - one more thing - what about Precession? Do you use that option > in Sidereal Astrology?? > > Thanks a lot! > > Shamira > > The Sidereal Zodiac is not based on the VE, so it is not subject to precession.. As long as you are using a natal chart calculated in the SZ, that is not a problem. It is only when you get into the mundo stuff, using RA and decl that you have to worry about prcession. > > > > " How can Pluto be in Sagittarius when it's so close to Antares? " ----- > > Post message: > Subscribe: - > Un: - > List owner: -owner > > Shortcut URL to this page: > / > > Quote Link to comment Share on other sites More sharing options...
Guest guest Posted July 15, 2002 Report Share Posted July 15, 2002 Thanks Bert - I have become a bit dependent on the computer and have forgotten some of this stuff - thanks for enlightening me! Shamira M - Bert Fannin Monday, July 15, 2002 9:06 PM Re: Precession On 15 Jul 2002, at 10:01, shamirashakira wrote: " shamirashakira " <shamira Date sent: Mon, 15 Jul 2002 10:01:05 -0000 Precession Send reply to: > > Oh - one more thing - what about Precession? Do you use that option > in Sidereal Astrology?? > > Thanks a lot! > > Shamira > > The Sidereal Zodiac is not based on the VE, so it is not subject to precession.. As long as you are using a natal chart calculated in the SZ, that is not a problem. It is only when you get into the mundo stuff, using RA and decl that you have to worry about prcession. > > > > " How can Pluto be in Sagittarius when it's so close to Antares? " ----- > > Post message: > Subscribe: - > Un: - > List owner: -owner > > Shortcut URL to this page: > / > > Quote Link to comment Share on other sites More sharing options...
Guest guest Posted September 7, 2008 Report Share Posted September 7, 2008 Dear Bejoy, This is  nice that you asked this question.I will try to explain in a simple way. Each star in the sky has a proper motion. These stars are  moving in all direction but in very slow motion i.e about 0.002 sec per year. The motion of each star though very slow but vary star to star. As these star are very far in the sky ,they appear almost fixed at a given location . Each star has longitude and latitude. By continuous observation since ancient Vadic days , it was found that the longitudes of all stars are increasing at a constant rate, though their is no change in their latitudes. Astronomers considered two options: 1The stars are moving but the movement of all stars are mostly identical which was impossible. So this option was discarded 2. The first point of Tropical Aries (which is the intersection of ecliptic and celestial    equator) is shifting backwards .They also observed there was no appreciable change in the latitudes of the stars. So they came to the conclusions that celestial equator and first point of the Aeries were moving in such a way that the longitudes of the stars were increasing. It clarifies that the vernal equinox is moving backward. The precession of equinoxes is mainly due to the attraction of sun and moon on the protuberant portions of the earth at the equator. the result is that the earth has a slow 'wobbling' motion, so that the point in the heavens (the celestial pole) describes  a small circle of about 47degree angular diameter round the pole of the ecliptic. this results also in change in the identity of the Polar Star from one era to another.  When the attracting body reaches its greatest north or south declination, the disturbance is greatest and zero when they are on the celestial equator. the luni-solar precession is in the ratio of 7:3 i.e., effect of moon's attraction is more than twice that of sun i.e, two thirds of the whole. The total of the two effects amounts to about 50'.35 yearly while that of planetary precession if 0'.11 annually. The mean net annual precession which is also called general precession is about 50 " .24 each year, on the average.  As the distances of the attracting bodies i.e. Sun, Moon,Planets, Asteroids, Comets etc changes, the value of precession changes. The circle on the celestial sphere is of only 47 degree diameter and takes 25,800 years to complete.  Its effect are important. Due to shifting of poles, the celestial equator also moves and in turn the position of vernal equinox that is the first point of Aries changes.  NUTATION  the effect of Sun's and Moon's attraction are not constant. moons is sometimes above and sometimes below the ecliptic and therefore its pull on the equatorial bulge of the earth is not always in the same direction as that of sun which results in the nodding of the celestial pole to and from the pole of the ecliptic. This nodding is called the nutation. The result is that the precession is some  times more and at other times less than its mean value by about 9 seconds of arc to either side in a period of 18 years 220 days or say 18 2/3 years in which moon's nodes make complete revolution in the heavens. Thus True Ayanamsa of any epoch may be defined as under: True Ayanamsa=Mean Ayanamsa +/- Nutation in longitude As you may have seen in my article that modern Astronomy had recalculated the constants, the old basis has completely transformed. Regards,   G.K.GOEL Bejoy <bejoy_cs Gopal Goel <gkgoel1937 Sunday, 7 September, 2008 5:10:19 PM Re: Precession Hi Goel Saab, After reading your write up, some doubts remain. One theory says that the precession of equinox ( PoE ) is happening due to Luni Solar wobble - that the sun and the moon is exerting differential pull along the equatorial bulge and the poles causing the equinox to precess w.r.to back ground stars and as a result, the equinox - say if its happening in Aries in AD 2000 will precess to pisces and moves west ward since and will be back in Aries in 25920 earth years. But another theory proposed by Sri. Yukteswar says that our sun is orbiting another object with an orbital period of 25920 earth years deep in space and this is why the background stars shift. Which one will you endorse. Regards Bejoy. Quote Link to comment Share on other sites More sharing options...
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