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Because there are approximately 365.2422 days in a {{w|solar year}}, various calendars use different means to keep the calendar year in sync with the solar year and the seasons. The Julian Calendar, for example, has leap days every four years, giving it an average year length of 365.25 days. The most widely used system is the {{w|Gregorian calendar}}, which also has leap days every four years, but skips leap days in years divisible by 100 unless the year is also divisible by 400, the latter additions come from Earth's {{w|axial precession}}. This gives it an average year length of 365.2425 days, which is very close to the length of a solar year (see detailed explanation in this video: ''[https://www.youtube.com/watch?v=82p-DYgGFjI Earth's motion around the Sun, not as simple as I thought]''). {{w|Calendar reform|Other calendars}} have been proposed, some of which do not count leap days and special "festival days" as a day of the week, in order to make every date fall on the same day of the week every year. | Because there are approximately 365.2422 days in a {{w|solar year}}, various calendars use different means to keep the calendar year in sync with the solar year and the seasons. The Julian Calendar, for example, has leap days every four years, giving it an average year length of 365.25 days. The most widely used system is the {{w|Gregorian calendar}}, which also has leap days every four years, but skips leap days in years divisible by 100 unless the year is also divisible by 400, the latter additions come from Earth's {{w|axial precession}}. This gives it an average year length of 365.2425 days, which is very close to the length of a solar year (see detailed explanation in this video: ''[https://www.youtube.com/watch?v=82p-DYgGFjI Earth's motion around the Sun, not as simple as I thought]''). {{w|Calendar reform|Other calendars}} have been proposed, some of which do not count leap days and special "festival days" as a day of the week, in order to make every date fall on the same day of the week every year. | ||
| − | *At "24 hours 4 minutes", EST days are longer, though there are only 360 of them in the year. The extra 4 minutes over the course of 360 days adds up to one standard day, so Randall's EST calendar would at this point have a year that is 361 standard days long | + | *At "24 hours 4 minutes", EST days are longer, though there are only 360 of them in the year. The extra 4 minutes over the course of 360 days adds up to one standard day, so Randall's EST calendar would at this point have a year that is 361 standard days long. |
*Running the clock backwards for 4 hours after every full moon gives 8 additional hours at each full moon, twelve or thirteen times in a year. Because a thirteenth full moon will occur once every 2.7 solar years on average, this modification adds 4.1228 standard days to an EST year, bringing it to 365.1228 days. | *Running the clock backwards for 4 hours after every full moon gives 8 additional hours at each full moon, twelve or thirteen times in a year. Because a thirteenth full moon will occur once every 2.7 solar years on average, this modification adds 4.1228 standard days to an EST year, bringing it to 365.1228 days. | ||
