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The ancient Egyptian calendar – a civil calendar – was a solar calendar with a 365-day year. The year consisted of three seasons of 120 days each, plus an intercalary month of five epagomenal days treated as outside of the year proper. Each season was divided into four months of 30 days.
The Sothic cycle or Canicular period is a period of 1,461 Egyptian civil years of 365 days each or 1,460 Julian years averaging 365 + 1 ⁄ 4 days each. During a Sothic cycle, the 365-day year loses enough time that the start of its year once again coincides with the heliacal rising of the star Sirius (Ancient Egyptian: spdt or Sopdet ...
The ancient Athenian calendar was a lunisolar calendar with 354-day years, consisting of twelve months of alternating length of 29 or 30 days. To keep the calendar in line with the solar year of 365.242189 days, an extra, intercalary month was added in the years: 3, 6, 8, 11, 14, 17, 19 of the 19-years Metonic cycle.
[4] [5] Of particular note was his discovery that two ancient Egyptian calendars were employed simultaneously: a 365-day calendar used for administrative needs, and a lunar calendar used for religious and agricultural purposes. [6] Parker's work in this area continues to influence Egyptological research. [7]
This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...
This Ptolemaic calendar reform failed, but was finally officially implemented in Egypt by Augustus in 26 or 25 BC, now called the Alexandrian calendar, [7] with a sixth epagomenal day occurring for the first time on 29 August 22 BC. [8] Julius Caesar had earlier implemented a 365 + 1 ⁄ 4 day year in Rome in 45 BC as part of the Julian calendar.
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The 360-day calendar is a method of measuring durations used in financial markets, in computer models, in ancient literature, and in prophetic literary genres.. It is based on merging the three major calendar systems into one complex clock [citation needed], with the 360-day year derived from the average year of the lunar and the solar: (365.2425 (solar) + 354.3829 (lunar))/2 = 719.6254/2 ...