2. Of or relating to the extra day falling in a leap year.
n.
A leap year.
[Late Latin bissextīlis, containing an intercalary day, from bisextus (diēs), bis sextus (diēs) and Latin bisextum, intercalary day : bis, twice; see bis + sextus, sixth (because the sixth day before the Calends of March on February 24 occurred twice every leap year); see sext1.]
[C16: from Late Latin bissextilis annus leap year, from Latin bissextus, from bi-1 + sextus sixth; referring to February 24, the 6th day before the Calends of March]
Le calendrier julien est donc un calendrier solaire de 11 mois de 30 et 31 jours chacun auxquels s'ajoutent un mois de 28 jours, plus AaAaAe de jour supplAaAaAeA@mentaire (annAaAaAeA@e bissextile tous les 4 ans), ce qui d une annAaAaAeA@e de 365 jours AaAaAeAa-.
This corresponds to 8 years minus 2 days (or 8 years minus 1 day if the interval includes a non bissextile century year), and approximates within two days to 13 sidereal revolutions of the planet.
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