Today the world is officially governed by the Gregorian Calendar that originated in the medieval Europe. Thus named because its promoter Pope Gregory XIII, who was substituted in 1582 by the Julian calendar, used since Julius Caesar put  it in place in 46 BC. Pope Gregory XIII promulgated the use of this calendar by the Bull Inter gravissimas. (Source Wikipedia "Gregorian calendar). Therefore, man has moved the seasons and years, regardless of established natural cycles. The Months of the Year. See here

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