15 Facts About Seven-day week

In many languages, the days of the Seven-day week are named after classical planets or gods of a pantheon.

English word Seven-day week comes from the Old English wice, ultimately from a Common Germanic, from a root "turn, move, change".

Seven-day week is named in many languages by a word derived from "seven".

The day of the week can be easily calculated given a date's Julian day number :Adding one to the remainder after dividing the Julian day number by seven yields that date's ISO 8601 day of the week.

Friedrich Delitzsch and others suggested that the seven-day week being approximately a quarter of a lunation is the implicit astronomical origin of the seven-day week, and indeed the Babylonian calendar used intercalary days to synchronize the last week of a month with the new moon.

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Seven-day week seems to have been adopted, at different stages, by the Persian Empire, in Hellenistic astrology, and in Gupta India and Tang China.

Seven-day week was widely known throughout the Roman Empire by the 1st century AD, along with references to the Jewish Sabbath by Roman authors such as Seneca and Ovid.

Days of the Seven-day week are called "days of the sabbath" in the Hebrew language.

Seven-day week was known in India by the 6th century, referenced in the Pancasiddhantika.

Epi Seven-day week is used to report healthcare statistics, as with COVID-19 cases:.

Term "Seven-day week" is sometimes expanded to refer to other time units comprising a few days.

An eight-day Seven-day week was used in Ancient Rome and possibly in the pre-Christian Celtic calendar.

Six-day Seven-day week is found in the Akan Calendar and Kabiye culture until 1981.

Several cultures used a five-day Seven-day week, including the 10th century Icelandic calendar, the Javanese calendar, and the traditional cycle of market days in Korea.

Evidence of a "three-day Seven-day week" has been derived from the names of the days of the Seven-day week in Guipuscoan Basque.