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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 ...
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 26 February 2025 is 2460733.
A 50-year "pocket calendar" that is adjusted by turning the dial to place the name of the month under the current year. One can then deduce the day of the week or the date. A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future.
Wednesday is the day of the week between Tuesday and Thursday. According to international standard ISO 8601, it is the third day of the week. [1] In English, the name is derived from Old English Wōdnesdæg and Middle English Wednesdei, 'day of Woden', reflecting the religion practised by the Anglo-Saxons, the English equivalent to the Norse ...
The Chinese did use the planetary naming system a long time ago, Tang dynasty and thereabouts -- that's where the Japanese names for days of the week came from. As for your question concerning the luni-solar calendar, it's quite possible for the week to be completely divorced from lunar and solar cycles.
A fragment of the Fasti Praenestini for the month of Aprilis, showing its nundinal letters on the left side The full remains of the Fasti Praenestini. The nundinae (/ n ə n ˈ d ɪ n aɪ /, /-n iː /), sometimes anglicized to nundines, [1] were the market days of the ancient Roman calendar, forming a kind of weekend including, for a certain period, rest from work for the ruling class ().
The Roman Calendar had assigned one of the planetary deities to each day of the week. The Byzantines naturally avoided using these Latin names with their pagan echoes. They began their week with the " Lord's Day " ( Kyriake ), followed by an orderly succession of numbered days: Deutera ("2nd"), Trite ("3rd"), Tetarte ("4th"), and Pempte ("5th ...
Likewise, the Modern Hebrew name for Monday is yom-sheni (יום שני). While in North America, Sunday is the first day of the week, the Geneva-based International Organization for Standardization places Monday as the first day of the week in its ISO 8601 standard. Monday is xīngqīyī (星期一) in Chinese, meaning "day one of the week".