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
Famous quotes containing the words facts and, facts and/or figures:
“The sway of alcohol over mankind is unquestionably due to its power to stimulate the mystical faculties of human nature, usually crushed to earth by the cold facts and dry criticisms of the sober hour. Sobriety diminishes, discriminates, and says no; drunkenness expands, unites, and says yes.”
—William James (1842–1910)
“So in your discussions of the nuclear freeze proposals, I urge you to beware the temptation of pride—the temptation blithely to declare yourselves above it all and label both sides equally at fault, to ignore the facts of history and the aggressive impulses of an evil empire, to simply call the arms race a giant misunderstanding and thereby remove yourself from the struggle between right and wrong, good and evil.”
—Ronald Reagan (b. 1911)
“Families suffered badly under industrialization, but they survived, and the lives of men, women, and children improved. Children, once marginal and exploited figures, have moved to a position of greater protection and respect,... The historic decline in the overall death rates for children is an astonishing social fact, notwithstanding the disgraceful infant mortality figures for the poor and minorities. Like the decline in death from childbirth for women, this is a stunning achievement.”
—Joseph Featherstone (20th century)