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  2. Tropical year - Wikipedia

    en.wikipedia.org/wiki/Tropical_year

    According to Blackburn and Holford-Strevens (who used Newcomb's value for the tropical year) if the tropical year remained at its 1900 value of 365.242 198 781 25 days the Gregorian calendar would be 3 days, 17 min, 33 s behind the Sun after 10,000 years. Aggravating this error, the length of the tropical year (measured in Terrestrial Time) is ...

  3. Lunar month - Wikipedia

    en.wikipedia.org/wiki/Lunar_month

    This slightly shorter period, 27.321 582 days (27 d 7 h 43 min 4.7 s), is commonly known as the tropical month by analogy with Earth's tropical year. [ 5 ] [ 12 ] Anomalistic month

  4. Solar calendar - Wikipedia

    en.wikipedia.org/wiki/Solar_calendar

    Such a calendar is called a tropical solar calendar [citation needed]. The duration of the mean calendar year of such a calendar approximates some form of the tropical year, usually either the mean tropical year or the vernal equinox year. The following are tropical solar calendars: Ancient Armenian calendar

  5. Sidereal and tropical astrology - Wikipedia

    en.wikipedia.org/wiki/Sidereal_and_tropical...

    Per tropical calculations, in contrast, persons born between March 21 – April 19 would have the sun sign of Aries. [11] Precession of equinoxes, the changing position of the vernal equinox over the course of about 25,800 years. The yellow line is a section of the ecliptic, the apparent path the Sun appears to follow over the course of an ...

  6. Metonic cycle - Wikipedia

    en.wikipedia.org/wiki/Metonic_cycle

    The Runic calendar is a perpetual calendar based on the 19-year-long Metonic cycle. It is also known as a Rune staff or Runic Almanac. This calendar does not rely on knowledge of the duration of the tropical year or of the occurrence of leap years. It is set at the beginning of each year by observing the first full moon after the winter solstice.

  7. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    The first step of the reform was to realign the start of the calendar year (1 January) to the tropical year by making 46 BC 445 days long, compensating for the intercalations which had been missed during Caesar's pontificate. This year had already been extended from 355 to 378 days by the insertion of a regular intercalary month in February.

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