Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v2.c12.s3.8
Bhāratīya Jyotiḥśāstra (History of Indian Astronomy), translated by R. V. Vaidya v2.c12.s3.8
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v2.c12.s3.8
The motions of planets in their respective orbits have been assumed to be the same and the lengths of orbits are found by dividing the length of the celestial orbit by the number of revolutions of planets in the Kalpa. This amounts to assuming that the times required by planets to revolve in their orbits are proportional to their orbits, that is, to the distances of planets from the Earth. But this is not true according to the modern astronomical theory. The modern theory established by Kepler and confirmed by NEWTON and others is that the square of the revolution period of the planet is proportional to the cube of its distance from the Sun.