History of Calendar

	Revision 31 . . (edit) November 20, 2001 6:29 pm by Karl Palmen [Add links]
	Revision 30 . . (edit) November 20, 2001 2:44 am by Paul Hill
	Revision 29 . . November 20, 2001 2:42 am by Paul Hill
	Revision 28 . . November 19, 2001 9:43 am by Hajhouse [*add url of calendar FAQ]
	Revision 27 . . (edit) November 16, 2001 7:36 pm by Karl Palmen [Modify ISO Week link]
	Revision 26 . . November 16, 2001 7:23 pm by Karl Palmen [For fiscal calendar add reference to ISO week and correct intercalation]
	Revision 25 . . November 16, 2001 2:48 pm by Balanone [Fiscal calendar]
	Revision 24 . . November 15, 2001 9:32 pm by Karl Palmen [Add talk]
	Revision 23 . . November 15, 2001 9:08 pm by Karl Palmen [Dipute definition of Calendar as Time Measurement]
	Revision 22 . . November 11, 2001 3:24 am by (logged).179.251.xxx

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Difference (from prior major revision) (minor diff, author diff)

Changed: 7c7,8

In the west, the year-based Julian calendar was adopted. It numbers days within months that are longer than the lunar cycle, so it is not convenient for tracking phases of the moon, but it does a better job tracking the seasons. Unfortunately, Earth's tropical year is not an exact multiple of days either (it is approximately 365.2422 days), so it too slowly drifted out of sync with the seasons. For such reasons, the Gregorian calendar was later adopted by most of the west.

In the Roman Empire, the year-based Julian calendar was adopted. It numbers days within months that are longer than the lunar cycle, so it is not convenient for tracking phases of the moon, but it does a better job tracking the seasons. Unfortunately, Earth's tropical year is not an exact multiple of days either (it is approximately 365.2422 days), so it too slowly drifted out of sync with the seasons. For such reasons, the Gregorian calendar was later adopted by most of the Western? starting in 1582, eventually spreading to be the dominant calendar currently in use in the world.

Changed: 9c10

Calendars may define other units of time, such as the week, for the purpose of scheduling regular activities that do not easily coincide with months or years.

Cultures may define other units of time, such as the week, for the purpose of scheduling regular activities that do not easily coincide with months or years.

Changed: 13c14

Even where there is a commonly used calendar such as the Gregorian calendar, alternate calendars may also be used, such as a fiscal calendar.

Even where there is a commonly used calendar such as the Gregorian calendar, alternate calendars may also be used, such as a Fiscal calendar.

Changed: 34c35

Calendars in use on Earth are most frequently lunar, solar, luni-solar,

Calendars in use on Earth are most frequently lunar, solar?, luni-solar

Changed: 36,37c37,38

an example is the Islamic calendar. A solar calendar is synchronized to the motion of the Sun; an example is the Persian calendar. A luni-solar

an example is the Islamic calendar. A solar calendar is synchronized to the motion of the Sun; an example is the [Persian calendar]?. A luni-solar

Changed: 39,40c40,41

example is the Jewish calendar. An arbitrary calendar is not synchronized to either the Moon or the Sun; an example is the Julian date used by

example is the Jewish calendar. An arbitrary calendar is not synchronized to either the Moon or the Sun; an example is the [Julian date]? used by

Changed: 91c92

/talk?

/talk?