The Moon, in his journey of the Zodiac, through the 27 constellations, creates the 27 Nakshatras, which have been defined as the Lunar Mansions of Hindu Astronomy, each one of them occupying 13 degrees 20 minutes of the Zodiac.
Chandra Siddhanta, Lunar Theory
This is the Equation given for the Moon’s largest perturbation. The Moon seems to be carried away by the immense gravitational pull of the Sun, causing its Ecliptic longitude to vary as much as 1.3 degrees. This has been referred to as the third major angle, Kendra, between Sthithi & Mandoccha in Ganitha Nirnaya and as the second Anomaly in Greek Astronomy, anomaly being the angle between position and perihelion.
Third Kendra
Sin ( 2*T – Mc ) * 4467
Where Mc = Chandra Madhyamam, Mean longitude of Chandra, T = Thidhi = Longitude of Chandra – Longitude of Soorya
Working on Chandra Siddhanta,
Major Theory of the Moon,
Fourteen Kendras, angles were plotted
By ace astronomers.
Small, small Manda anomalies,
Angles between position & aphelion
As fourteen major perturbations
Of the Moon were identified !
The Essence of Sidddhantas Eighteen
Is the Sanskrit Ganita Nirnaya
Puliyoor studied all eighteen
Plus Aryaabhaateeya and Maha Bhaskareeya.
Siddhantas Arya, Brahma Sphuta,
Pancha Siddantika and Siddhanta Siromani,
And came out with a gem
Based on Parameswara’s Model Geometric !
The Longitude Corrected Thrice,
Manda means Reduction to Heliocentric
Parinathi means Reduction to Ecliptic
And Sheeghra means Reduction to Geocentric.