HaYom Yom 7 Shvat

When the Alter Rebbe was nine he studied geometry and astronomy. At ten he composed a calendar for fifteen years. When he was twelve years old, it happened that he lectured publicly on Rambam’s laws of kidush hachodesh.[1] The preeminent Torah-scholars who were present at that time in the study-hall were utterly overwhelmed.

Footnote:

[1]Much of this treatise is devoted to complex astronomical calculations relative to projected appearance of the new moon, etc.

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