Wednesday Sh'vat 7 5703
Chumash: Bo, Revi'i with Rashi.
Tehillim: 39-43.
Tanya: Ch. 18. To explain (p. 75)...incorporated in it. (p. 75).
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 happenned 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.
Notes:
Much of this treatise is devoted to complex astronomical calculations relative to projected appearance of the new moon, etc.