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seder olam Raba-

the Tanaim themselves going through the dates from page one of tanach onward.
https://www.sefaria.org/Seder_Olam_Rabbah.1?lang=bi

for a understanding that is the year 5778 from adam harishon. the creation of the universe (cause until an observer sees nothing really exists) and see professor gerald schroeder shlita hyv on youtube for the scientific explanation and an explanation of how we look out at the universe and see 13.7billion years and we count 5778...