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  2. 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 ...

  3. Chinese calendar - Wikipedia

    en.wikipedia.org/wiki/Chinese_calendar

    The traditional Chinese calendar, dating back to the Han dynasty, is a lunisolar calendar that blends solar, lunar, and other cycles for social and agricultural purposes. . While modern China primarily uses the Gregorian calendar for official purposes, the traditional calendar remains culturally significa

  4. 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 .

  5. Lunisolar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunisolar_calendar

    The classic Metonic cycle can be reproduced by assigning an initial epact value of 1 to the last year of the cycle and incrementing by 11 each year. Between the last year of one cycle and the first year of the next the increment is 12 – the saltus lunae (Latin for 'leap of the moon') – which causes the epacts to repeat every 19 years. When ...

  6. Metonic cycle - Wikipedia

    en.wikipedia.org/wiki/Metonic_cycle

    The (19-year) Metonic cycle is a lunisolar cycle, as is the (76-year) Callippic cycle. [8] An important example of an application of the Metonic cycle in the Julian calendar is the 19-year lunar cycle insofar as provided with a Metonic structure. [9] Meton introduced the 19 year cycle to the Attic calendar in 432 BC.

  7. 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.

  8. Lunar month - Wikipedia

    en.wikipedia.org/wiki/Lunar_month

    The term lunar month usually refers to the synodic month because it is the cycle of the visible phases of the Moon. Most of the following types of lunar month, except the distinction between the sidereal and tropical months, were first recognized in Babylonian lunar astronomy .

  9. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    The widely used solar aspect is a cycle of leap days in a 400-year cycle designed to keep the duration of the year aligned with the solar year. [37] There is a lunar aspect which approximates the position of the moon during the year, and is used in the calculation of the date of Easter. [38]