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Two unrelated epochs that have gained some traction in the scientific community are the Mars sol date and the Mars year. In 1998 Michael Allison proposed the Mars sol date epoch of 29 December 1873 (Julian Day 2405521.502). [9] In 2000 R. T. Clancy et al. proposed the Mars year 1 set to the epoch 11 April 1955 (Julian Day 2435208.456). [10]
Czech astronomer Josef Šurán offered a Martian calendar design in 1997, in which a common year has 672 Martian days distributed into 24 months of 28 days (or 4 weeks of 7 days each); in skip years, the week at the end of the twelfth month is omitted.
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.
The seven-day week was adopted in early Christianity from the Hebrew calendar, and gradually replaced the Roman internundinum. [citation needed] Sunday remained the first day of the week, being considered the day of the sun god Sol Invictus and the Lord's Day, while the Jewish Sabbath remained the seventh.
The Julian calendar (365.25 days) and Gregorian calendar (365.2425 days) will be one year apart. [169] The Julian day number (a measure used by astronomers) at Greenwich mean midnight (start of day) is 19 581 842.5 for both dates.
In Japanese, the second day of the week is 火曜日 (kayōbi), from 火星 (kasei), the planet Mars. Similarly, in Korean the word Tuesday is 화요일 (hwa yo il), means literally fire day, and Mars the planet is referred to as the fire star with the same words, but this is unrelated to the Roman god Mars, which is referred to phonetically as ...
NASA will test a nuclear-powered rocket for space travel. The technology could speed up a manned trip to Mars from the current seven-month minimum to 45 days.
(In proposals that add single days outside the week, like the World Calendar, a true "seventh day" of rest or worship would drift between weekends and weekdays.) No day is more than 5 days before or after its Gregorian namesake and nearly all days are within 4 days. Since the revised version is compatible with ISO week date, a lot of software ...