The above accounts for 48 days from the time of Bhisma’s fall to the time of his passing. However, it is generally accepted that Grandfather Bhisma had 58 sleepless nights between the time of his fall and the time of his passing. Yet, if you count the 10 days that he lead the armies into war in which he may also have not been able to sleep, that would give the full 58 sleepless nights that are described.
The famous astronomical text known as the Surya Siddhanta also states that the sun was 54 degrees away from the vernal equinox when Kali-yuga began on a new moon day, which corresponds to February 17/18, 3102 at Ujjain (75deg47minE 23deg 15 min N). [Also found inSurya Siddhanta: Translation of an Ancient Indian Astronomical Text, Translation by Bapu Deva, Benares, 1860]
From the internal evidence in the Mahabharata text, the coronation of Maharaja Yudhisthir can be determined to be 36 years before the beginning of Kali-yuga, or about 3138 BCE. One scholar, Dr. Patnaik, had calculated the date of the starting of the Mahabharata war to be October 16, 3138 BCE from references available in the epic itself.
Of course, different scholars may arrive at variations in their calculations, and there have been a few different versions of the Mahabharata, and over the many centuries since it was written, additions and accretions are found. For example, verses 2.28.48-9 mention roma andantakhi in Sanskrit, which some scholars interpret to mean Rome and Antioch. This places these mentions not earlier than 300 BCE since Antioch was founded in 301.
However, this does not limit the age of the earlier form of the Mahabharata, which is known to have been written shortly after the war of Kurukshetra.
Nonetheless, as B. N. Narahari Achar explains, other scholars have proposed varying years for the Mahabharata war, from 3102 BCE to 3139 BCE. However, none of these dates can produce the astronomical configurations described in the Mahabharata.
Another point of consideration is that it is generally accepted by most Vedic scholars that the age of Kali-yuga began in February 17-18 of 3102 BCE, which also coincides with the astronomical configurations. This also is given credence from the Aryabhatta Tradition in which Aryabhatta, who lived 476-550 CE, explains that when he was 23 years old, 3600 years of Kali-yuga had elapsed. Aryabhatta, one of the great mathematicians and astronomers of India in the 5th century CE, examined the astronomical positions recorded in the Mahabharata. In his work, the Aryabhattiya, he calculated that the approximate date to be 3100 BCE, justifying the date of the Kurukshetra war to have been fought about 5000 years ago, as the tradition itself and most Hindus have always said.
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