Editing Talk:2431: Leap Year 2021
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: 365 years plus (around) 33% more because every fourth year (except every hundredth, except except every 400th) is already ''expected'' to have a 29th, so you'd not be able to shift the year that year and have to do those days after the first 365 mostly-shifted consecutive years - with the necessary overflow days ''still'' being only to be done for 3/4(ish) of the next 91ish years, leaving maybe 23 more years to be shifted. But 24 years would only allow 18 shifts, so 6 more years than that ''probably'' would use 5 years. And one year may be absorbed already, or left over. So 365+91+23+6. Ish. Because it'd depend exactly which year you start as to which non-expandable years occur within the strict (0.75)+(0.25*0.75)+(0.25*0.25*0.75)+... series. But that's the likely area of the answer, off the top of my head. Around 485 years, give or take. Unless I've made a big error! [[Special:Contributions/141.101.98.244|141.101.98.244]] 03:02, 2 March 2021 (UTC) | : 365 years plus (around) 33% more because every fourth year (except every hundredth, except except every 400th) is already ''expected'' to have a 29th, so you'd not be able to shift the year that year and have to do those days after the first 365 mostly-shifted consecutive years - with the necessary overflow days ''still'' being only to be done for 3/4(ish) of the next 91ish years, leaving maybe 23 more years to be shifted. But 24 years would only allow 18 shifts, so 6 more years than that ''probably'' would use 5 years. And one year may be absorbed already, or left over. So 365+91+23+6. Ish. Because it'd depend exactly which year you start as to which non-expandable years occur within the strict (0.75)+(0.25*0.75)+(0.25*0.25*0.75)+... series. But that's the likely area of the answer, off the top of my head. Around 485 years, give or take. Unless I've made a big error! [[Special:Contributions/141.101.98.244|141.101.98.244]] 03:02, 2 March 2021 (UTC) | ||
::A quick evaluation of the geometric progression (a/1-r = 365/(1-1/4)) gives an answer of 486.666... This means it would take at least 487 years to come past full circle (488 on a leap year) if not for the pesky 400-year rule. Given where the date lies, there can be either one or two per cycle; thus, we find a minimum of 488 years and a maximum of 490. If we started this current year, on a non-leap year with no round 400 in the next 87 years, it would take the minimum amount, 488 years, to cycle through 489 revolutions of the Earth around the Sun. Happy Leap Year, my friends! [[User:BlackHat|BlackHat]] ([[User talk:BlackHat|talk]]) 03:52, 2 March 2021 (UTC) | ::A quick evaluation of the geometric progression (a/1-r = 365/(1-1/4)) gives an answer of 486.666... This means it would take at least 487 years to come past full circle (488 on a leap year) if not for the pesky 400-year rule. Given where the date lies, there can be either one or two per cycle; thus, we find a minimum of 488 years and a maximum of 490. If we started this current year, on a non-leap year with no round 400 in the next 87 years, it would take the minimum amount, 488 years, to cycle through 489 revolutions of the Earth around the Sun. Happy Leap Year, my friends! [[User:BlackHat|BlackHat]] ([[User talk:BlackHat|talk]]) 03:52, 2 March 2021 (UTC) | ||
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Can someone make a [[:Category:Calendar]] that is a subcategory of [[:Category:Time]]? I feel like there are several comics that could fit, e.g. [[994: Advent Calendar]], [[1140: Calendar of Meaningful Dates]], [[1930: Calendar Facts]], [[1073: Weekend]], [[1061: EST]], etc. [[Special:Contributions/162.158.255.210|162.158.255.210]] 02:39, 2 March 2021 (UTC) | Can someone make a [[:Category:Calendar]] that is a subcategory of [[:Category:Time]]? I feel like there are several comics that could fit, e.g. [[994: Advent Calendar]], [[1140: Calendar of Meaningful Dates]], [[1930: Calendar Facts]], [[1073: Weekend]], [[1061: EST]], etc. [[Special:Contributions/162.158.255.210|162.158.255.210]] 02:39, 2 March 2021 (UTC) | ||
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Sweden tried something like this in the early 18th century. When switching from Julian to Gregorian calendar, some bright spark decided to do it gradually, by removing all leap days between 1700 and 1740. The leap day of 1700 was skipped (It was a leap day in the Julian calendar, but not the Gregorian), but due to war and other things they 'forgot' to annul the leap days of 1704 and 1708. In 1712 it was decided to revert to Gregorian calendar, by adding a double leap day, resulting in the only known occurrence of [https://en.wikipedia.org/wiki/List_of_non-standard_dates#February_30 February 30]. From 1700 to 1712 Sweden was out of sync with both the Gregorian and Julian calendars, resulting in quite a lot of confusion. For example, Carl Linnaeus birthday can be given as May 12, 13 or 23, depending on what calendar is used. [[User:Popup|Popup]] ([[User talk:Popup|talk]]) 07:22, 2 March 2021 (UTC) | Sweden tried something like this in the early 18th century. When switching from Julian to Gregorian calendar, some bright spark decided to do it gradually, by removing all leap days between 1700 and 1740. The leap day of 1700 was skipped (It was a leap day in the Julian calendar, but not the Gregorian), but due to war and other things they 'forgot' to annul the leap days of 1704 and 1708. In 1712 it was decided to revert to Gregorian calendar, by adding a double leap day, resulting in the only known occurrence of [https://en.wikipedia.org/wiki/List_of_non-standard_dates#February_30 February 30]. From 1700 to 1712 Sweden was out of sync with both the Gregorian and Julian calendars, resulting in quite a lot of confusion. For example, Carl Linnaeus birthday can be given as May 12, 13 or 23, depending on what calendar is used. [[User:Popup|Popup]] ([[User talk:Popup|talk]]) 07:22, 2 March 2021 (UTC) | ||
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