Intercalate synonyms

It Has Been Stated By Scaliger, Weidler, Montucla, And Others, That The Modern Persians Actually Follow This Method, And Intercalate Eight Days In Thirty Three Years.

The era began on the 11th of July 552, and their year is vague, that is to say, it does not intercalate a day in February every fourth year, like the Julian calendar.

Not Even Appear That The Length Of The Intercalary Month Was Regulated By Any Certain Principle, For A Discretionary Power Was Left With The Pontiffs, To Whom The Care Of The Calendar Was Committed, To Intercalate More Or Fewer Days According As The Year Was Found To Differ More Or Less From The Celestial Motions.