Continuing on from the previous post, in this post I show the Surya Siddhantha model for the mean motion of all the celestial bodies (click on the figure below to jump to the actual animated model):
The above model is built using the parameters specified in Chapter 1 of Surya Siddhantha (quoted below):
“In a Yuga, the revolutions of the Sun, Mercury and Venus, and of the conjunctions of Mars, Saturn and Jupiter, moving eastward, are four million, three hundred and twenty thousand.
Of the moon, fifty seven million seven hundred and fifty three thousand three hundred and thirty six; of Mars two million two hundred and ninety six thousand eight hundred and thirty two.
Of Mercury’s conjunctions (shigra) seventeen million nine hundred and thirty seven thousand and sixty; of Jupiter three hundred and sixty four thousand two hundred and twenty.
Of Venus’s conjunctions (shigra) seven million twenty two thousand three hundred and seventy six; of Saturn one hundred and forty six thousand five hundred and sixty eight.”
- Surya Siddhantha, Chapter 1, Verse 29 – 32
“Of the asterisms, one billion, five hundred and eight two million, two hundred and twenty seven thousand, eight hundred and twenty eight. The number of risings of the asterisms, diminished by the number of the revolutions of each planet respectively, gives the number of risings of the planets in a Yuga”
- Surya Siddhantha, Chapter 1, Verse 34
Clicking on the check box against each celestial body positions the model to the end of the orbital period of that celestial body, i.e. to the time when the celestial body returns back to the start of Aries. It is easy to compare these orbital periods with the modern values (for instance, using Wikipedia).
The correspondence is amazing considering the Surya Siddhantha was written over 1800 years back!