The Chitra Paksha (Lahiri) ayanamsha, which is popular these days, rarely provides the right results. See in "Ayanamsas — A Statistical Study. Buz Overbeck".

A very different ayanamsha is found in Surya Siddhanta (4th-8th centuries CE). In this traditional Indian text, the ayanamsha is based on the ...

There was an independent test of different ayanamshas, on a variety of reliable birth charts. The best results have been produced by three ayanamshas, all of which are Revati oriented.

According to most Horas:
• Model of the structure of the world - Geocentric.
• Grahas movement is realistically observed (Drik Ganita).
• Bhavas are equal to the size of Rashis.

According to most Siddhantas:
• Model of the structure of the world - Heliocentric.
• Grahas movement is ...