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  2. Portal:Astronomy/Events/February 2012 - Wikipedia

    en.wikipedia.org/.../Events/February_2012

    Moon: Conjunction of Planets with the Moon: Neptune 5.5º south of Moon 22:37 Moon: Lunar Phases: New moon: Diameter = 30.5 ' 23 February 00:00 Moon: Conjunction of Planets with the Moon: Mercury 5.6º south of Moon 24 February 08:00 Moon: Conjunction of Planets with the Moon: Uranus 5.3º south of Moon 25 February 19:00 Moon: Conjunction of ...

  3. File:Phase and libration of the Moon at hourly intervals ...

    en.wikipedia.org/wiki/File:Phase_and_libration...

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Pages for logged out editors learn more

  4. 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 ...

  5. Lunar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunar_calendar

    Lunar calendar year 2025. 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.

  6. Octaeteris - Wikipedia

    en.wikipedia.org/wiki/Octaeteris

    In astronomy, an octaeteris (Greek: ὀκταετηρίς, plural: octaeterides) is the period of eight solar years after which the moon phase occurs on the same day of the year plus one or two days. This period is also in a very good synchronicity with five Venusian visibility cycles (the Venusian synodic period ) and thirteen Venusian ...

  7. 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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  9. 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.