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2. 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. [ a] A purely lunar calendar is distinguished from a lunisolar calendar, whose ...

3. 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. The apparent wobbling of the Moon is known as libration.

4. Lunar phase - Wikipedia

   en.wikipedia.org/wiki/Lunar_phase

   A lunar phase or Moon phase is the apparent shape of the Moon 's directly sunlit portion as viewed from the Earth (because the Moon is tidally locked with the Earth, the same hemisphere is always facing the Earth). In common usage, the four major phases are the new moon, the first quarter, the full moon and the last quarter; the four minor ...

5. 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.

6. List of solar cycles - Wikipedia

   en.wikipedia.org/wiki/List_of_solar_cycles

   As at Aug 15, 2024, solar cycle 25 is averaging 36% more spots per day than solar cycle 24 at the same point in the cycle (Aug 15, 2013). Year 1 of SC25 (Dec 2019 to Nov 2020) averaged 101% more spots per day than year 1 of SC24. Year 2 of SC25 (Dec 2020 to Nov 2021) averaged 7% more spots per day than year 2 of SC24.

7. Chinese calendar - Wikipedia

   en.wikipedia.org/wiki/Chinese_calendar

   The traditional Chinese calendar ( traditional Chinese: 農曆; simplified Chinese: 农历; lit. 'agricultural calendar'; informally traditional Chinese: 陰曆; simplified Chinese: 阴历; lit. ' lunar calendar ') is a lunisolar calendar, combining the solar, lunar, and other cycles for various social and agricultural purposes.