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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 ...
Historically, the Greco-Roman week began with Sunday (dies solis), and Monday (dies lunae) was the second day of the week. [3] It is still the custom to refer to Monday as feria secunda in the liturgical calendar of the Catholic Church. Quakers also traditionally referred to Monday as "Second Day". [6]
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 29 December 2024 is 2460674.
In the liturgy of the Catholic Church, a feria is a day of the week other than Sunday. [1] In more recent official liturgical texts in English, the term weekday is used instead of feria. [2] If the feast day of a saint falls on such a day, the liturgy celebrated may be that of the saint, not that of the feria (the weekday liturgy). Accordingly ...
Another method is by adding 9 months and 7 days to the first day of the last menstrual period. Naegele's rule is named after Franz Karl Naegele, the German obstetrician who devised the rule. Naegele was born July 12, 1778, in Düsseldorf, Germany. In 1806, Naegele became ordinary professor and director of the lying-in hospital in Heidelberg.
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The semaine sanglante (" Bloody Week") was a weeklong battle in Paris from 21 to 28 May 1871, during which the French Army recaptured the city from the Paris Commune.This was the final battle of the Paris Commune.
Image source: Getty Images. Driving may be one of the most convenient ways to get from point A to point B, but you pay a premium for that convenience: Car insurance.