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  2. Borana calendar - Wikipedia

    en.wikipedia.org/wiki/Borana_calendar

    A lunar-stellar calendar, the Borana Calendar relies on astronomical observations of the moon in conjunction with seven particular stars or constellations. Borana months (Stars/Lunar Phases) are Bittottessa (), Camsa (), Bufa (), Waxabajjii (), Obora Gudda (Central Orion-Saiph), Obora Dikka (), Birra (full moon), Cikawa (gibbous moon), Sadasaa (quarter moon), Abrasa (large crescent), Ammaji ...

  3. Lunar theory - Wikipedia

    en.wikipedia.org/wiki/Lunar_theory

    The lunar longitude has a twice-monthly Variation, by which the Moon moves faster than expected at new and full moon, and slower than expected at the quarters. There is also an annual effect, by which the lunar motion slows down a little in January and speeds up a little in July: the annual equation .

  4. Libration - Wikipedia

    en.wikipedia.org/wiki/Libration

    The lunar phases and librations in 2019 in the Northern Hemisphere at hourly intervals, with music, titles, and supplemental graphics Simulated views of the Moon over one month, demonstrating librations in latitude and longitude. Also visible are the different phases, and the variation in visual size caused by the variable distance from Earth.

  5. Lunar phase - Wikipedia

    en.wikipedia.org/wiki/Lunar_phase

    The Moon then wanes as it passes through the gibbous moon, third-quarter moon, and crescent moon phases, before returning back to new moon. The terms old moon and new moon are not interchangeable. The "old moon" is a waning sliver (which eventually becomes undetectable to the naked eye) until the moment it aligns with the Sun and begins to wax ...

  6. Lunar prediction program (SUPARCO) - Wikipedia

    en.wikipedia.org/wiki/Lunar_prediction_program...

    The lunar prediction program (or SUPARCO New Moon prediction programme) is an active scientific mission of the SUPARCO aims to conduct studies and predicts the appearances and phases of the Moon. [ 1 ] [ 2 ] On a regular and monthly basis, SUPARCO provides illustrative predictions for the visibility and the parameters for the sighting of the ...

  7. Lunar Laser Ranging experiments - Wikipedia

    en.wikipedia.org/wiki/Lunar_Laser_Ranging...

    The Moon has free physical librations that require one or more stimulating mechanisms. [45] Tidal dissipation in the Moon depends on tidal frequency. [42] The Moon probably has a liquid core of about 20% of the Moon's radius. [11] The radius of the lunar core-mantle boundary is determined as 381 ± 12 km. [46]

  8. Lunar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunar_calendar

    A lunar calendar is a calendar based on the monthly cycles of the Moon's phases (synodic months, lunations), in contrast to solar calendars, whose annual cycles are based on the solar year. The most widely observed purely lunar calendar is the Islamic calendar .

  9. Lunar month - Wikipedia

    en.wikipedia.org/wiki/Lunar_month

    Due to tidal locking, the same hemisphere of the Moon always faces the Earth and thus the length of a lunar day (sunrise to sunrise on the Moon) equals the time that the Moon takes to complete one orbit around Earth, returning to the same lunar phase. While the Moon is orbiting Earth, Earth is progressing in its orbit around the Sun.

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