Significados de intercalary month en inglés

He inserted the regular intercalary month of twenty-three days, and two additional ones of sixty-seven days.

The letter dealing with the calendar was written to inform Sin-idinnam, the governor of Larsam, that an intercalary month was to be inserted.

In this year the January with 29 and the February with 23 days were followed by the intercalary month with 28, and then by March.