'Claudius Ptolemy' supposedly lived in ~150 CE Egypt. And whatever Egyptian/Babylonian epistemic knowledge he had is treated as 'Greek Knowledge' without question. And western historians have been telling us,
"Aryabhata got his astronomy from Greeks"
Lets see
'Unknown text' -->Accreted Arab Al Majisti-->Latin-->'Original Greek text'
Almost funny!
If Ptolemy existed and he wrote a text called Almagest, the manuscript that survives today is completely different in content & scope. It does not represent the knowledge of 2nd century Greece. It represents the accumulated knowledge in 12th CE Europe.
Indians have never tried to undermine other cultures. But maybe it is time we did.