This also addresses how Indian's discovered Zero and Decimal System.
This was a very interesting exercise. I was already given the clue: "chan-chan" is "sun-sun" for it being a very ever sunny site.
I thought in Sanskrit, there would be sounds like that from where the sound for Sun came out. And I found two words.
The word for Sanskrit Sun is "sunuu". And the word for verb "go" is "shun" where "sh" is palatal and can also become "ch" or even "z", (English letter 'x' is Sanskrit Compound Sibiliant 'kS' or 'ksh', Dental 's' is 'sa', Palatal 'sh', 'ch' or 'z' are 'z', and there is none for Sanskrit Cerberal "S').
The Sanskrit word for zero is "O" is "shunya", and it looks like it looks like a circle and the attribute of sun as orbit is "go-go" or perpetual going.
Indians may have got the idea of Decimal System and Zero by looking at the Solar Orbits and they completing perfect cycles before starting from scratch or zero again!