Everyone knows hottest planetary fashions proposed by Kepler, Ptolemy and Copernicus. Indian astronomers additionally proposed completely different planetary fashions. Earliest Indian planetary mannequin was the ‘Dawn system’ – the place day begins at dawn. Later Aryabhata I (576 AD) proposed a brand new ‘Midnight system’ – day beginning at midnight.
It’s well-known that the Indian astronomers have been primarily within the profitable computations of the longitudes and latitudes of the Solar, Moon and the planets and weren’t a lot fearful about proposing fashions of the universe. Nonetheless, detailed observations recommended some geometrical fashions.
Modification of earlier Indian planetary fashions
Throughout the fifteenth century main revisions have been made to the planetary idea. Significantly Nilkantha, the Indian astronomer, carried out main revisions of the sooner Indian planetary mannequin for the inside planets – Mercury and Venus.
Paramesvara (1380-1460 AD)
Paramesvara has mentioned intimately the geometrical mannequin implied within the earlier Indian planetary idea. In his Siddhantadipika, he offers a extra detailed exposition of the geometrical mannequin.
Nilkantha Somasutvan (1444-1550 AD)
Nilkantha carried out in his treatise Tantrasangraha (1500AD), a significant revision for the sooner Indian planetary mannequin for the inside planets Mercury and Venus. This led Nilkantha to a a lot better formulation of the equation of centre for these planets then was out there both in earlier Indian, Islamic or European. (Until the works of Kepler, which occurred greater than a 100 years later).
Nilkantha in Golasara, Siddhanta-darpana, Aryabhatiyabhashya, explains that computational scheme developed by him implies a geometrical image of planetary movement. In his mannequin – all 5 planets – Mercury, Venus, Mars, Jupiter and Saturn – transfer in eccentric orbits across the Solar, which in flip goes across the Earth. A lot of the Astronomers succeeding Nilkantha, adopted this planetary mannequin.
Earlier Indian planetary mannequin used two strategies for calculating planetary motions, one for exterior planets and different for inside. Nilkantha by his modification solved the issue of there being two completely different guidelines for calculating the planetary motions.
~AK
