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A leap week calendar is a calendar system with a whole number of weeks in a year, and with every year starting on the same weekday. Most leap week calendars are proposed reforms to the civil calendar, in order to achieve a perennial calendar. Some, however, such as the ISO week date calendar, are simply conveniences for specific purposes. [1]
These 53-week years occur on all years that have Thursday as 1 January and on leap years that start on Wednesday. The extra week is sometimes referred to as a leap week, although ISO 8601 does not use this term. Weeks start with Monday and end on Sunday. Each week's year is the Gregorian year in which the Thursday falls.
Hanke–Henry Permanent Calendar pre-2016 version with weeks still starting Sunday, but Xtra already at the end of the year. In 2004, Richard Conn Henry, a professor of astronomy at Johns Hopkins University, proposed the adoption of a calendar known as Common-Civil-Calendar-and-Time (CCC&T), which he described as a modification to a proposal by Robert McClenon.
Leap day exists to even out time discrepancies between the calendar year and the solar year. While it's widely accepted that a calendar year has 365 days, it takes Earth about 365.242 days to ...
Caesar created a new Julian calendar for Rome that measured a year as 365.25 days long, as the original Roman year was 10 days shorter than a modern year. The seasons were thrown off as a result ...
A leap year is a year in which an extra day, Feb. 29, is added to the calendar. It's called an intercalary day. It occurs about every four years, but there are exceptions (we'll get to that later).
The solar cycle is a 28-year cycle of the Julian calendar, and 400-year cycle of the Gregorian calendar with respect to the week. It occurs because leap years occur every 4 years, typically observed by adding a day to the month of February, making it February 29th. There are 7 possible days to start a leap year, making a 28-year sequence. [1]
On a non-Leap Year, some leapers choose to celebrate the big day on Feb. 28. Some choose to celebrate on March 1. Some even choose both days or claim the whole month of February to celebrate.