Mechanics of the ayanamsha

[Guest guest]

Hello dear members,

 

I am quite new to the list (and to vedic astrology as well).

 

For some times, I have tried to understand and find a logic behind

the ayanamsha evaluation... A French astrologer, Denis Labouré, once

stated that the correct ayanamsha was either the one of Krushna or

the one of Bhasin.

 

However, I find all this very " mathematical " and theorical. I would

like to know if the ayanamsha is still evaluated on the basis of the

fixed stars (espacially Spica/Chitra and Zeta Piscium/Revati)?

 

Actually I have come to the conclusion that it is, using the rising

and espacially the setting of the star Spica, to a null latitude (0°

0' N). The result are near both Bhasin and Krushna ayanamshas (using

the excel worksheet). To make this calculations, I used Astrolog32

and a modified fixed stars which includes Spica and Zeta Piscium.

 

The idea is to know the time when Spica sets at 0°N of latitude, to

calculate the chart of this specific moment and adjust the offset of

the ayanamsha in such a way that the rising sign equates 0°10'01'

Aries (Revati being considered at 29°49'59 " Pisces).

 

The logic behind my reasonning comes from this sentence of

Hipparchos, taken on the Swiss Ephemeris website

[http://www.astro.com/swisseph/swisseph.htm#_Toc6813679]:

 

" Raymond Mercier has shown that all of the ancient Greek and the

medieval Arabic astronomical works located the zero point of the

ecliptic somewhere between 10 and 22 arc minutes east of the star

zeta Piscium. This definition goes back to the great Greek astronomer

Hipparchus. How did he choose that point? Hipparchus said that the

beginning of Aries rises when Spica sets. This statement was meant

for a geographical latitude of 36°, the latitude of the island of

Rhodos, which Hipparchus' descriptions of rises and settings are

referred to. " .

 

The important sentence being " Hipparchus said that the beginning of

Aries rises when Spica sets " .

 

For example, today december 4, 2004.

 

At a longitude of 0°W and a latitude of 0°N, Spica sets at 14h30m27s.

So, if I adjust the ayanamsha offset for the ascendant to be at 0°

10'1 " Aries, it must be 22°54'57.351 " , according the my software. The

excel worksheet gives 22°55'6 "

 

The results I get using this method seem always near to those of

Krushna ayanamsha worksheet results.

 

Can anyone explain clearly and easily this mechanic of the ayanamsha?

Also, must we evaluate the ayanamsha for a null latitude (0°N), to be

valid for all the Earth?

 

--

Best regards - François