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Thursday is the day of the week between Wednesday and Friday. According to the ISO 8601 international standard, it is the 4th day of the week. [1] In countries which adopt the "Sunday-first" convention, it is the fifth day of the week. [2]
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 ...
This leaves only four days on which Rosh Hashanah is allowed to fall: Monday, Tuesday, Thursday and Saturday (i.e. the first, second, or fourth days of the week, or Shabbat), which are also referred as the "four gates" (Hebrew: ארבעה שערים, romanized: arba'a shearim).
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 ...
In some Muslim countries, Saturday is the first day of the week and thus Tuesday is the fourth day of the week. The English name is derived from Middle English Tewesday, from Old English Tiwesdæg meaning "Tīw's Day", the day of Tiw or Týr, the god of single combat, law, and justice in Norse mythology.
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 7 January 2025 is 2460683.
The planetary hours are an ancient system in which one of the seven classical planets is given rulership over each day and various parts of the day. Developed in Hellenistic astrology, it has possible roots in older Babylonian astrology, and it is the origin of the names of the days of the week as used in English and numerous other languages.
For determination of the day of the week (1 January 2000, Saturday) the day of the month: 1 ~ 31 (1) the month: (6) the year: (0) the century mod 4 for the Gregorian calendar and mod 7 for the Julian calendar (0). adding 1+6+0+0=7. Dividing by 7 leaves a remainder of 0, so the day of the week is Saturday. The formula is w = (d + m + y + c) mod 7.