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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. Solar calendar - Wikipedia

    en.wikipedia.org/wiki/Solar_calendar

    The Islamic calendar is a purely lunar calendar and has a year, whose start drifts through the seasons and so is not a solar calendar. The Maya Tzolkin calendar, which follows a 260-day cycle, has no year, therefore it is not a solar calendar. Also, any calendar synchronized only to the synodic period of Venus would not be solar.

  4. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  5. 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

  6. Month - Wikipedia

    en.wikipedia.org/wiki/Month

    A month is a unit of time, used with calendars, that is approximately as long as a natural phase cycle of the Moon; the words month and Moon are cognates.The traditional concept of months arose with the cycle of Moon phases; such lunar months ("lunations") are synodic months and last approximately 29.53 days, making for roughly 12.37 such months in one Earth year.

  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.

  8. 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 ...

  9. Template:Sidereal and tropical zodiac dates - Wikipedia

    en.wikipedia.org/wiki/Template:Sidereal_and...

    Tropical zodiac dates [1] Sidereal zodiac dates [2] [3] [4] (Lahiri ayanamsa) Dates based on 14 equal length sign zodiac used by Schmidt [5] [i] Based on IAU boundaries [6] Aries: Mar 21 – Apr 19: April 14 – May 14: April 16 – May 11: Apr 18 – May 13 Cetus [i] — — May 12 – June 6 [i] — [dubious – discuss] Taurus: Apr 20 ...

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