ayanamsa effect

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lefteye
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ayanamsa effect

Post by lefteye » 13 May 2019

Learned Members,
How do we justify the nirayana positions of nakshatras when unlike planets, they fall on other rasis. By subtracting ayanamsa,the actual positions vary from nirayana almost by one sign?
Request to refer this link.
https://en.wikipedia.org/wiki/List_of_Nakshatras



Krishna
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Re: ayanamsa effect

Post by Krishna » 18 Aug 2019

Nirayana positions are calculated only for grahas and not nakshatras. Beginning of aswini coincides with beginning of mesha.

lefteye
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Re: ayanamsa effect

Post by lefteye » 19 Aug 2019

@Krishna
Thanks for the reply.

Longitudes are the references common for all astro bodies. Due to Earth's precession, we will be changing our polestar also. We deduce ayanamsa to keep the zodiac in 0 position taking Aries as reference. So we have the 27 stars in order.

Planets are traceable easily. My question or rather confusion is the identity of the stars in the signs.

From the link, I find the data as:
Indian zodiac: 0° - 13°20' Mesha
Western zodiac 26° Aries - 9°20' Taurus
For Ashvini .


If I use Western, Ashvini is Revati. It is not happening with the planets. A sun will be Sun wherever it stands.

Krishna
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Re: ayanamsa effect

Post by Krishna » 20 Aug 2019

Grahas are moving bodies. Nakshatras are stationary bodies. Hence, reference is wrt nakshatras.

Consider the nakshatra Chitra. It has a bright star called Spica which is easily recognisable in the night sky. Fix Spica's reference at 180deg which is the end of Kanya and beginning of Tula rasi. The constellation Chitra spreads from 173 deg20min to 186deg40min.

If you check the position of Spica as per western or sayana ephemeris, it is around 203deg or so. Subtract the ayanamsa called chitrapaksha ayanamsa (approximately 23deg) to get the nirayana position of Spica at 180deg.

Another easily recognisable star is Aldebaran. It is a bright red star seen near the Orion belt and approximately around 50deg as per nirayana. It is in Rohini nakshatra which spans from 40deg to 53deg20min in Rishabha.

Krishna
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Re: ayanamsa effect

Post by Krishna » 20 Aug 2019

Due to precision, ayanamsa changes over time but reference of Spica is fixed at 180deg.

Krishna
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Re: ayanamsa effect

Post by Krishna » 20 Aug 2019

A correction
Aldebaran is around 47deg nirayana or approximately 70deg sayana.

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