Vol 16.12 - Bo 1
Hebrew Text
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Rambam Kiddush HaChodesh - Chapter-One
Summary
Explanation of Rambam (Beg. Hil Kiddush HaChodesh): "The months of the year are lunar months...The years we follow are solar years". Resolution of the question of the "Pirush" on Rambam (6:10) that "at the end of the cycle the difference between the days of the solar calendar [and the lunar calendar] will be only one hour and 485 units."that if so, after many years, the Tekufa of Nissan will be in Iyar.
The reason that we follow the Tekufa of Shmuel ( even though the calculation of R' Ada is "more correct" (4:6)