I am not trying to prove that he measured it, rather I am refusing to make assumptions. I am arguing (to So Sayana was probably guessing, and he was wrong) that a guess not "more" probable than a measurement - not knowing where he got the data from & going by the accuracy of the #. Secondly, Sayana's verse is a commentary on a verse in the Rigveda. It's not a verse in the Rgveda - the original verse has no relation to this topic except that it is in praise of the sun.