No. The leap day was inserted one year late for the period of the calendar use.ethan2 said:But when the year started in march was the leap year the year before(1665)?
no problem thanksIbix said:I see. No idea - probably searchable, though.
thank you very muchBaluncore said:No. The leap day was inserted one year late for the period of the calendar use.
https://en.wikipedia.org/wiki/Gregorian_calendar#Beginning_of_the_year
https://en.wikipedia.org/wiki/Bissextus
https://en.wikipedia.org/wiki/Intercalation_(timekeeping)
It depends on what the Church decided it should be, with the calendar they used back then.ethan2 said:If the year started on, for example, 1 March, two months later than our present year, when was the leap day inserted?
A leap day is an extra day added to the calendar to keep it synchronized with the Earth's orbit around the Sun. In the Gregorian calendar, which is a solar calendar, this day is February 29th and is added every four years to account for the fact that a year is not exactly 365 days but approximately 365.25 days.
A leap day is inserted every four years in the Gregorian calendar. However, there are exceptions to this rule: years that are divisible by 100 are not leap years unless they are also divisible by 400. For example, the year 2000 was a leap year, but 1900 was not.
A leap day is necessary to correct the discrepancy between the calendar year and the astronomical year. The Earth's orbit around the Sun takes about 365.25 days, so without the leap day, the calendar would drift out of alignment with the seasons over time. By adding a leap day approximately every four years, this drift is corrected.
The concept of the leap day was first introduced by Julius Caesar in 45 BCE with the Julian calendar. The Julian calendar added a leap day every four years. This system was later refined by the Gregorian calendar, introduced by Pope Gregory XIII in 1582, which included additional rules to improve accuracy.
The insertion of a leap day can affect annual events and holidays by shifting them one day forward in the calendar for that year. For example, if a holiday falls on a Monday in a common year, it will fall on a Tuesday in a leap year. This adjustment ensures that the calendar remains consistent with the seasons and astronomical events.