how come that there are seven days in a week but days in a year differ in calanders followed around the world

Answer 1

Weeks are based loosely on the phases of the moon.

Days in the year differ by whether the calendar is a solar calendar (based on the earth's orbit around the sun) or a lunar calendar (based on the moon's cycle).

I can't believe that the educational system somewhere is so poor that someone would think that what time zone you're in would have anything to do with how many days are in a year.

Answer 2

There have been seven days in a week for millenia, based on custom, belief that seven is a lucky number, biblical tales, or other reasons, and it has held up because it is a reasonable division between working and relaxation. The calendar has to deal with the annoying fact that the number of days in a year is about 365.2242 (depending on what sort of year you are talking about -- astronomers identify several different kinds, depending on what is being measured; this figure is for the "tropical" year, which has to do with the repeat of the seasons), which is an awkward number to deal with. The first reasonable solar calendar was promulgated by Julius Caesar, it specified a leap year every four years to deal with the odd fraction. But that is too many leap years, and by the 16th century the error had accumulated to more than a week. On the advice of his astronomers, Pope Gregory promulgated a new calendar, in which leap years were eliminated on century years unless the year was divisible by 400; and to fix the accumulated error, eleven days were dropped from the calendar. This went over well in most of the civilized world, except for Britain, which didn't fall into line until the 18th century (see history of Henry VIII and the Anglican Church for more on this). Except for starting dates for the year, this calendar is now used throughout most of the world. A notable exception is the Islamic calendar, in which the year is defined as twelve cycles of the moon. Since this results in a "year" of 354 days, that calendar rotates slowly with respect to the seasons, and Hajj this year [just ended] was earlier than it was a few years ago.

See reference for a thorough treatment of various calendars, and methods of converting between them.

Answer 3

For every country the time zone differs thatswhy some difference in calenders

Answer 4

Very interesting. Well, some of it would be the time zone, wouldn't it?

Answer 5

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