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  2. Coligny calendar - Wikipedia

    en.wikipedia.org/wiki/Coligny_calendar

    A synodic month has 29.53 days, so the calendar overcomes any slight slippage or temporary imbalance by the month of MID EQVOS having either 29 or 30 days as required to keep the calendar in sync with the lunar phase. [b] The Coligny calendar is designed to keep perfectly in sync with the lunar phase, [c] with a tolerance of less than 24 hours ...

  3. 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 ...

  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. Selenographic coordinate system - Wikipedia

    en.wikipedia.org/wiki/Selenographic_coordinate...

    At this location the selenographic colongitude at sunrise is defined as 0°. Thus, by the time of the Full Moon the colongitude increases to 90°; at Last Quarter it is 180°, and at the New Moon the colongitude reaches 270°. Note that the Moon is nearly invisible from the Earth at New Moon phase except during a solar eclipse.

  6. 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 .

  7. 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 ...

  8. Lunar month - Wikipedia

    en.wikipedia.org/wiki/Lunar_month

    In lunar calendars, a lunar month is the time between two successive syzygies of the same type: new moons or full moons. The precise definition varies, especially for the beginning of the month. Animation of the Moon as it cycles through its phases, as seen from the Northern Hemisphere

  9. Moonrise and moonset - Wikipedia

    en.wikipedia.org/wiki/Moonrise_and_moonset

    A full moon sinking behind San Gorgonio Mountain, California, on a midsummer morning. Moonrise and moonset are times when the upper limb of the Moon appears above the horizon and disappears below it, respectively. The exact times depend on the lunar phase and declination, as well as the observer's location.

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