SINCE 1828
Julian calendar
noun
Ju·lian calendar
| \ ˈjül-yən-
\
\
Definition of Julian calendar
: a calendar introduced in Rome in 46 b.c. establishing the 12-month year of 365 days with each fourth year having 366 days and the months each having 31 or 30 days except for February which has 28 or in leap years 29 days — compare gregorian calendar
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From the Editors at Merriam-Webster
Bissextile
Bissextile
An old name for 'leap day'
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The first known use of Julian calendar was in 1696
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