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Ayanamsa

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ayanamsa : The arc that describes the increasing gap between the tropical and sidereal zodiacs. The ayanamsa, which changes continually at the rate of approximately 50" a year, is currently about 24°.
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ayanamsa From the Hindu ayana, the arc that describes the increasing gap between the tropical and sidereal zodiacs. The ayanamsa, which changes continually at the rate of approximately 50" a year, is currently about 24°.

AYANAMSA
The difference between the Tropical (Sayana) and the Sidereal (Nirayana) longitudes.

Ayanamsa - The difference between the starting point of the Tropical and Sidereal Zodiacs, due to the precession of the equinoxes.

Lahiri AyanamsaMost widely used Ayanamsa (22°27'37.7"). There is disagreement among authorities on the precise arc of this ayanamsa. Lame (degrees)Deficient degrees, held to cause lameness or other deformities and disabilities.

Savanna and Nirayana and Ayanamsa
The celestial equator is a great circle of the celestial sphere marked out by indefinite extension of the plane of terrestrial equator.

To convert a Tropical zodiac into a Sidereal zodiac one needs to know the current ayanamsa and subtract it from the tropical longitudes of the planets. The most widely accepted ayanamsa in India was introduced by N.C. Lahiri.

The two systems are about 23 days apart (called the "ayanamsa") from where they mark the first point of the sign of Aries, which is the start of the circle of the zodiac (you have to start a circle somewhere).

Chart calculation as well as Astro-cartography, harmonics, directions, converse, ayanamsa, sabians ...

The sidereal zodiac differs from the tropical zodiac by an offset called the ayanamsa, which steadily increases as the equinoxes drift further.

Although '́nitial point' would generally indicate the First Point of Aries, Yeats is probably disputing the date of when the Tropical and Sidereal Zodiacs coincided. This is usually considered to be after 200 AD/CE and 'Lahiri's ayanamsa', ...

See also: Sun, On the, Moon, Plane, Planet