Ignoring Easter, the Julian calendar repeats every **28** years.

Ignoring weekdays, the Julian calendar repeats every **48** months.

The Pawukon calendar has a period of **210** days.

The Tzolk'in calendar has a period of **260** days.

Ignoring Easter, the Julian calendar repeats every **336** months.

In the Maya calendar, one *tun* is equal to **360** *k'in*.

A common year has **365** days.

A leap year has **366** days.

The Gregorian calendar repeats every **400** years.

The Julian calendar repeats every **532** years.

In common years, the month of February has **672** hours.

In leap years, the month of February has **696** hours.

A 30-day month (April, June, September or November) containing a spring DST transition has **719** hours.

A 30-day month (April, June, September or November) not containing a DST transition has **720** hours.

A 30-day month (April, June, September or November) containing a fall DST transition has **721** hours.

A 31-day month (January, March, May, July, August, October or December) containing a spring DST transition has **743** hours.

A 31-day month (January, March, May, July, August, October or December) not containing a DST transition has **744** hours.

A 31-day month (January, March, May, July, August, October or December) containing a fall DST transition has **745** hours.

Ignoring Easter, the Julian calendar repeats every **1,461** weeks.

Ignoring weekdays, the Julian calendar repeats every **1,461** days.

**4,609** is the first year in which Julian Easter and Gregorian Pentecost coincide. There is a German proverb “wenn Ostern und Pfingsten auf einen Tag fallen” equivalent to the English “when pigs fly”, but this applies only if both holidays are calculated according to the same calendar.

The Gregorian calendar repeats every **4,800** months.

The Julian calendar repeats every **6,384** months.

**8,202** is the first year with a conflict between the ecclesiastical rule and the Gauss-Bach rule for the Easter date.

Ignoring Easter, the Julian calendar repeats every **10,227** days.

The Gregorian calendar repeats every **20,871** weeks.

The Julian calendar repeats every **27,759** weeks.

The Gregorian calendar repeats every **146,097** days.

In the Maya calendar, one *kalabtun* is equal to **160,000** *tun*.

The Julian calendar repeats every **194,313** days.

The Hebrew calendar repeats every **689,472** years.

The Hebrew calendar repeats every **8,527,680** months.

The Hebrew calendar repeats every **35,975,351** weeks.

In the Maya calendar, one *alautun* is equal to **64,000,000** *tun*.

The Hebrew calendar repeats every **251,827,457** days.