The Ganitha Nirnaya, one of the best books on Mathematical Astrology

Now the genius of Puliyoor Purushotaman Namboothiri condensed the thousands of slokas of the 18 Siddhantas into 1000 odd slokas, called the Ganitha Nirnayam. It is one of the best books on Mathematical Astrology ever written. He was ably assisted by the Maths Professor, Prof Krishna Warrier.

In the Kerala system, 14 major perturbations of the Moon are highlighted and 14 trignometric corrections are done for the 14 lunar anomalies.

Chathur dasebhyebhyo balanyabhibhyo
Neethva Thulasadi Vasa Dhanarnam

Krithva tad Indor Apaneeya Thungam
Thado Mridujya phala Samskruthendu

( Ganitha Nirnayam )


After computing the Chandra Madhyamam, the mean longitude of the Moon, after 14 trignometric corrections, the longitude is called Samskrutha Chandra Madhyamam, Samskruthendu.

Then the Parinathi Kriya or Parinathi Samskara, Reduction to the Ecliptic is done.

Vikshepa Vritheeya Gatho Vipatha
Thasmannayel Jyam Parinathyabhikhyam
Yugmau pada sarvam idam Vidheyam
Syal Kranti Vritteeya Ehaisha Chandra.

( Ganitha Nirnaya )

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