This little month was considered to be an intercalary period, which brought the season of 365 days.

There are thus 12 ordinary months plus an intercalary month.

Intercalary months have the same branch as the preceding month.

The first 22 days of the intercalary month were inserted between these two parts.

So an intercalary month is added every third year.

Both use what are called intercalary or inserted chapters.

Before then, the Romans added whole intercalary months in an unsystematic way.

The way to determine whether or not an intercalary month should be added was by agricultural observation in Israel.

This has led to a superstition that intercalary months in certain times of the year bring bad luck.

Special days and periods (such as leap day or intercalary day).

If any of the red intercalary zones are included, their sum has to be subtracted.

It improved the prediction of planets' positions and included an "intercalary month."

It means that the intercalary month was equally likely to occur after any month of the year until 1645.

This year had already been extended from 355 to 378 days by the insertion of a regular intercalary month in February.

The Buddhist calendar adds both an intercalary day and month on a usually regular cycle.

To find out which year will have an intercalary month, divide the Burmese year by 19.

The red or blue fields in zones 5, 7, 16 and 17 are intercalary zones.

The Báb did not, however, specify where the intercalary days should go.

If the barley was not ripe an intercalary month would be added before Nisan.

A month without a midpoint of a solar term is an intercalary month.

There are four intercalary days in a regular year, and five in a leap year.

Most designs for Martian calendars intercalate single days, but a few use an intercalary week.

In leap years, a second "intercalary day" follows Saturday, 30 June.

The trial progresses, intercalary chapters provide a fuller picture of social issues, and you see what happens when the two fathers meet.

There are, roughly speaking, two options to achieve this goal: leap week calendars and intercalary days.