Bharata has been continuously and relatively densely lived in for thousands of years and in Northern Bharata the archeological evidence is difficult to come by because of many 100's of generations of people living in same area.
Hence, it is usual to look for Puranic and Vedic (written and oral recitation) astronomical evidence to substantiate the time periods.
Lunar eclipse occurs when Earth's shadow falls on the Moon. Lunar eclipses can occur only at full moon, and can be either total or partial. Total lunar eclipses can last up to 2 hours, while partial lunar eclipses can last up to 4 hours.Using modern astronomical software, our article shows that a number of Thirteen day eclipse pairs were visible in Kurukshethra.Article suggests some candidate dates for Mahabharata war.It probably may have been rewritten/re-rendered many times as the mode of transference was by oral traditions as in the case of Vedic chandas prosody.The known oldest version has nearly 90,000 to 100,000 poems dominantly with 32 syllables Anushtup chandas, in 18 chapters called Parva's [ref-4 and 5].