The Jewish Calendar

Ask when their birthday is, then ask when Chanukah is. Someone will say “it moves.” Hold that up as the year’s first real question — and hand out moon-phase strips.

Children wonder and discover; you facilitate more than you lecture.

• Why do Jewish holidays land on different days each year?
• What does the moon have to do with time?
• Whose calendar is “normal”?

A Jewish month begins with the new moon, so a month is about twenty-nine and a half days and a lunar year runs about eleven days short of a solar one. Left alone, Passover would drift into winter — so seven times every nineteen years an extra month, Adar II, is added. This is the framing unit for a year about Jewish time, and it does something quietly powerful: an eight-year-old discovers that the calendar on the kitchen wall is one system among several, not the truth. Everything else this year — Shabbat, the festivals, holidays around the world — sits inside that discovery.

• Chodesh — month (from the word for “new”)
• Rosh Chodesh — the new moon, the head of the month
• Levanah — moon
• Shanah me’uberet — a leap year, literally a “pregnant year”

“Is the Jewish calendar wrong, then?”

Neither one is wrong. They are measuring different things — ours watches the moon, and it has kept our holidays in the right seasons for thousands of years.

“Why add a whole month instead of a day?”

Because we are fixing a moon problem, and moons come in months. A single day would not catch us up.

• Children can explain that Jewish months follow the moon.
• Children can name why a Jewish date and a secular date do not line up.
• Children can locate several holidays on a circular Jewish year.

Children in interfaith families may live by two calendars already and know this in their bones. Invite that expertise instead of teaching around it — “some of you already keep two calendars; what is that like?”

Folktale. The Moon and the Sun (Talmud, Chullin 60b) — the moon complains that two great lights cannot share one sky, is made smaller, and is given the stars for company and Rosh Chodesh for honour.

Changemaker. Hillel II — in the fourth century published the calculated calendar so that Jews scattered anywhere in the world could keep the same holidays on the same days.

I wonder what you would notice about time if you watched the moon every night for a month?

“We learned why Jewish holidays ‘move’ — our months follow the moon. Try at home: look at the moon together this week and guess how close Rosh Chodesh is.”