Wednesday, February 20, 2013

Kerala astronomers

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This is the diagram of Manda Kriya, Reduction to the Heliocentric Coordinate System, given by the equation R e Sin M, where e is eccentricity, R is the Radius of the Circle, M is the Anomaly.

The Manda Anomaly is found out by subtracting Aphelion, Mandoccha from the Mean Longitude.

Mean Longitude - Aphelion = Manda Anomaly.

R = 360/ 2 Pi or 180/Pi or 57.3*60*60 = 206265 seconds or Vikalas.

This amount thus got is added to the mean longitude if ML > 180 and deducted if ML < 180.


The Kerala astronomers predate their Western counterparts, particularly Kepler and Laplace by centuries. In his Thesis " The Model of Planetary Motion in the works of the Kerala astronomers", Prof Ramasubramaniam, Physics Professor, Madurai University observes " In conclusion, it may be noted that there is a vast literature on astronomy, including mathematics, both in Sanskrit and Malayalam produced by the Kerala School during the period 14-19th century. Only a fraction of it has been published and so far only a few studies of these texts have appeared ".

The era and the astronomer

Parameswara   - 15th century
Neelakanta      - 16th century
Kepler                17th
Laplace               18


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