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The day of the week can be easily calculated given a date's Julian day number (JD, i.e. the integer value at noon UT): Adding one to the remainder after dividing the Julian day number by seven (JD modulo 7 + 1) yields that date's ISO 8601 day of the week. For example, the Julian day number of 28 January 2025 is 2460704.
The working week is Monday to Friday; 8 hours per day, 40 hours in total per week (7 hours per day, 35 hours in total per week for civil servants). Street shops are almost always open on Saturday mornings but shopping centres are typically open every day (including Saturdays and Sundays).
The Babylonians invented the actual [clarification needed] seven-day week in 600 BCE, with Emperor Constantine making the Day of the Sun (dies Solis, "Sunday") a legal holiday centuries later. [2] In the international standard ISO 8601, Monday is treated as the first day of the week, but in many countries it is counted as the second day of the ...
Earth-based: the day is based on the time it takes for the Earth to rotate on its own axis, as observed on a sundial [citation needed]. Units originally derived from this base include the week (seven days), and the fortnight (14 days). Subdivisions of the day include the hour (1/24 of a day), which is further subdivided into minutes and seconds ...
A table of hours is shown for a sequence of seven days, with the day of the week indicated both for the sunrise (hour 1) and the sunset (hour 13) naming conventions. Day hours are calculated by adding up the amount of minutes from sunrise and sunset, then dividing by 12.
Known affectionately to scientists as the "boring billion," there was a seemingly endless period in the world's history when the length of a day stayed put. The time when a day on Earth was just ...
The international standard ISO 8601 sets Saturday as the sixth day of the week. [19] The three Abrahamic religions (Judaism, Christianity, and Islam) regard Saturday as the seventh day of the week. As a result, many refused the ISO 8601 standards and continue to use Saturday as their seventh day.
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