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  2. Axial precession - Wikipedia

    en.wikipedia.org/wiki/Axial_precession

    In astronomy, axial precession is a gravity-induced, slow, and continuous change in the orientation of an astronomical body's rotational axis. In the absence of precession, the astronomical body's orbit would show axial parallelism . [ 2 ]

  3. Milankovitch cycles - Wikipedia

    en.wikipedia.org/wiki/Milankovitch_cycles

    Axial precession is the trend in the direction of the Earth's axis of rotation relative to the fixed stars, with a period of about 25,700 years. Also known as the precession of the equinoxes, this motion means that eventually Polaris will no longer be the north pole star .

  4. Apsidal precession - Wikipedia

    en.wikipedia.org/wiki/Apsidal_precession

    Apsidal precession is considered positive when the orbit's axis rotates in the same direction as the orbital motion. An apsidal period is the time interval required for an orbit to precess through 360°, [2] which takes the Earth about 112,000 years and the Moon about 8.85 years. [3]

  5. Precession - Wikipedia

    en.wikipedia.org/wiki/Precession

    In astronomy, precession refers to any of several slow changes in an astronomical body's rotational or orbital parameters. An important example is the steady change in the orientation of the axis of rotation of the Earth , known as the precession of the equinoxes .

  6. Uttarayana - Wikipedia

    en.wikipedia.org/wiki/Uttarayana

    Illustration of the movement of the Sun north and south of the Equator, caused by axial tilt of the Earth. Illustration of the observed effect of Earth's axial tilt. This festival is currently celebrated on the 14th or 15 January but due to axial precession of the Earth it will continue to shift away from the actual season. The season occurs ...

  7. Great Year - Wikipedia

    en.wikipedia.org/wiki/Great_Year

    The origin of the Platonic Year would seem to have no connection with the precession of the equinoxes as this was unknown in Plato's time. [11] Two centuries after Plato, Hipparchus is credited with discovering the period of equinox precession , [ 12 ] and the term "Great Year" eventually came to be applied to the period of that precession ...

  8. 11 must-see astronomy events in 2025 - AOL

    www.aol.com/weather/11-must-see-astronomy-events...

    From planetary meet-ups to the first total lunar eclipse in three years, here are the top astronomy events to look for throughout 2025: Stellar views of Mars will greet stargazers in January as ...

  9. Lunar precession - Wikipedia

    en.wikipedia.org/wiki/Lunar_precession

    After one nodal precession period, the number of draconic months exceeds the number of sidereal months by exactly one. This period is about 6,793 days (18.60 years). [3] As a result of this nodal precession, the time for the Sun to return to the same lunar node, the eclipse year, is about 18.6377 days shorter than a sidereal year.