we changed from julian to gregorian calendar on october 1582.
we changed from julian to gregorian calendar on october 1582.
when did we change from julian to gregorian calendar?
october 1582
bullet::::- the relation between the julian calendar, gregorian calendar and the underlying astronomical solar or tropical year. the julian calendar, introduced by julius caesar, was long known to introduce a discrepancy from the tropical year of around one day for each century that the calendar was in use. by the time the gregorian calendar was introduced in ad 1582, illig alleges that the old julian calendar should have produced a discrepancy of thirteen days between it and the real (or tropical) calendar. instead, the astronomers and mathematicians working for pope gregory xiii had found that the civil calendar needed to be adjusted by only ten days. (the julian calendar day thursday, 4 october 1582 was followed by the first day of the gregorian calendar, friday, 15 october 1582). from this, illig concludes that the ad era had counted roughly three centuries which never existed.
phantom time hypothesis
sweden's transition to the gregorian calendar was difficult and protracted. sweden started to make the change from the julian calendar and towards the gregorian calendar in 1700, but it was decided to make the (then 11-day) adjustment gradually by excluding the leap days (29 february) from each of 11 successive leap years, 1700 to 1740. meanwhile, the swedish calendar would be out of step with both the julian calendar and the gregorian calendar for 40 years; also, the difference would not be constant but would change every four years. this system had potential for confusion when working out the dates of swedish events in this 40-year period. to add to the confusion, the system was poorly administered, and the leap days that should have been excluded in 1704 and 1708 were not excluded. the swedish calendar (according to the transition plan) should have been 8 days behind the gregorian but was 10 days behind. king charles xii recognised that the gradual change to the new system was not working, and he abandoned it.
adoption of the gregorian calendar