WORD OF THE MONTH

A weekly feature of Torah Tidbits to help clarify practical and conceptual aspects of the Jewish Calendar, thereby better fulfilling the mitzva of HaChodesh HaZeh Lachem...

This Shabbat, we bench and announce Rosh Chodesh Kislev, which will be Tuesday and Wednesday. "Usually", there is only one day R"Ch for Kislev, since Cheshvan "usually" has only 29 days. In a "full" year (when there are 355 or 385 days between one Rosh HaShana and the next), Cheshvan will have a 30th day and R"Ch Kislev will be two days.
Cheshvan regularly has 29 days. How often does it have a 30th day (as it does this year)? Almost 45% of the time.

ROSH CHODESH KISLEV YIH-YEH B'YOM SH'LISHI UVYOM R'VI'I HABA
ALEINU V'AL KOL YISRA'EL L'TOVA:

The molad is SUN 8:21:7 (8:00am Isr.) which is announced as follows:

HAMOLAD YIH-YEH LEIL SHLISHI CHAMEISH DAKOT USH’MONA CHALAKIM
ACHAREI TEISHA

In Rambam notation: Sunday 14: 385
Actual molad: SUN 7:14am Israel time

Chayei Sara is Shabbat M'vorchim Cheshvan 68% of the time. Specifically, when Rosh HaShana is Monday, Tuesday, or Shabbat. 32% of the time, RH is Thursday and Tol'dot is M'vorchim (Machar Chodesh)

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