Facts and Figures
- 1 week = 7 days = 168 hours = 10,080 minutes = 604,800 seconds (except at daylight saving time transitions or leap seconds)
- 1 Gregorian calendar year = 52 weeks + 1 day (2 days in a leap year)
- 1 week = 1600⁄6957 ≈ 22.9984% of an average Gregorian month
In a Gregorian mean year there are 365.2425 days, and thus exactly 52 71⁄400 or 52.1775 weeks (unlike the Julian year of 365.25 days or 52 5⁄28 ≈ 52.1786 weeks, which cannot be represented by a finite decimal expansion). There are exactly 20871 weeks in 400 Gregorian years, so 30 April 1611 was a Saturday just like 30 April 2011.
A system of Dominical letters has been used to determine the day of week in the Gregorian or the Julian calendar.
Read more about this topic: Seven-day Week
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