Question

calendar Ki Khoj kab aur Kisne ki thi???

Answer 1

The New Year in 709 AUC began on 1 January and ran over 365 days until 31 December. Further adjustments were made under Augustus, who introduced the concept of the "leap year" in 737 AUC (AD 4). The resultant Juliancalendar remained in almost universal use in Europe until 1582.
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Answer 2

calendar discovered by British archeology experts in 8,000 BC .