bissextile etymology

Etymology:

  • Latin: "bissextus," meaning "twice the sixth"

Meaning:

  • An intercalary day, added to the calendar every four years (February 29th), to make the average calendar year equal to the astronomical year.

Origin:

The term "bissextile" has its origin in the pre-Julian Roman calendar, which had 355 days in a year. To compensate for the difference between the calendar year and the astronomical year (which is about 365.2422 days), an intercalary day, called the "Dies Intercalaris," was inserted every other year between February 23rd and 24th.

This system, however, led to inaccuracies over time, and in 46 BCE, Julius Caesar introduced the Julian calendar, which added an extra day to February every four years. This intercalary day was placed before the Dies Intercalaris, which was renamed "Dies Bissextus" (twice the sixth day before the Calends of March).

The term "bissextile" stuck, and it has been used to refer to the intercalary day for centuries.

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