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- The '''Babylonian calendar''' was a [[lunisolar calendar]] with years consisting of 12 [[lunar month]]s, each beginning whe ...bout [[499 BC]] the months began to be regulated by a [[lunisolar calendar|lunisolar]] cycle of 19 years equaling 235 months. Although usually called the [[Meto11 KB (1,646 words) - 05:24, 24 July 2015