when did sunday became the seventh day of the week
1988
title: Names of the days of the week text: Meiji era. In China, with the founding of the Republic of China in 1911, Monday through Saturday in China are now named after the luminaries implicitly with the numbers. Sunday comes first in order in calendars shown in the table below. In the Judeo-Christian or Abrahamic tradition, the first day of the week is Sunday. Biblical Sabbath (corresponding to Saturday), when God rested from , made the day following Sabbath the first day of the week (corresponding to Sunday). Seventh-day Sabbaths were sanctified for celebration and rest. After the week was adopted in early Christianity, Sunday remained the first day title: Sunday text: the seventh day of the week. The name "Sunday", the day of the Sun, is derived from Hellenistic astrology, where the seven planets, known in English as Saturn, Jupiter, Mars, the Sun, Venus, Mercury and the Moon, each had an hour of the day assigned to them, and the planet which was regent during the first hour of any day of the week gave its name to that day. During the 1st and 2nd century, the week of seven days was introduced into Rome from Egypt, and the Roman names of the planets were given to each successive day. Germanic title: Week text: calendar with its irregular month lengths and the traditional seven-day week were used in the Soviet Union during its entire existence, including 1929–1940; for example, in the masthead of Pravda, the official Communist newspaper, and in both Soviet calendars displayed here. The traditional names of the seven-day week continued to be used, including "Resurrection" (Воскресенье) for Sunday and "Sabbath" (Суббота) for Saturday, despite the government's officially atheistic policy. Week A week is a time unit equal to seven days. It is the standard time period used for cycles of rest days in most parts of the world, mostly alongside—although not title: Week text: Week A week is a time unit equal to seven days. It is the standard time period used for cycles of rest days in most parts of the world, mostly alongside—although not strictly part of—the Gregorian calendar. The days of the week were named after the classical planets (derived from the astrological system of planetary hours) in the Roman era. In English, the names are Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday . ISO 8601 includes the ISO week date system, a numbering system for weeks within a given year – each week begins on a Monday and is title: Sunday text: beautiful and radiant in all his splendor! Of you, Most High, he bears the likeness." The ancient Romans traditionally used the eight-day nundinal cycle, a market week, but in the time of Augustus in the 1st century AD, a seven-day week also came into use. Justin Martyr, in the mid 2nd century, mentions "memoirs of the apostles" as being read on "the day called that of the sun" (Sunday) alongside the "writings of the prophets." On 7 March 321, Constantine I, Rome's first Christian Emperor (see Constantine I and Christianity), decreed that Sunday would be observed as the Roman day