Whyis there a disagreement among mathematicians and astrologers about whether the Pandavas year incognito ended before or after the day Duryodhan invaded and heard the twang of Arjun’s bow? After all, a simple date and month check would clarify this, right? The confusion exists because Indians at this time were using a lunar calendar. Lunar calendars determine months and day of the month according to moon phases, while a year is decided these days by the earth’s position relative to the sun. This work is set in ancient India sometime before 7000 BCE it ten thousand years ago. The Indian mathematician Aryabhatta would postulate heliocentric movement of the earth only in the 3rd century AD. Therefore, there are discrepancies between a solar year and a lunar year.