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The Lunation Number or Lunation Cycle is a number given to each lunation beginning from a specific one in history. Several conventions are in use. The most commonly used was the Brown Lunation Number (BLN), which defines "lunation 1" as beginning at the first new moon of 1923, the year when Ernest William Brown's lunar theory was introduced in the American Ephemeris and Nautical Almanac.
The duration from full moon to new moon (or new moon to full moon) varies from approximately 13 days 22 + 1 ⁄ 2 hours to about 15 days 14 + 1 ⁄ 2 hours. Due to lunar motion relative to the meridian and the ecliptic, in Earth's northern hemisphere: A new moon appears highest at the summer solstice and lowest at the winter solstice.
The Moon rises 30 to 70 minutes (should be a fixed number, about 50 minutes, if it's the same 13 degrees) later each day/night than the day/night before, due to the fact that the Moon moves 13 degrees every day. Hence, the Earth must move 13 degrees after completing one rotation for the Moon to be visible. [7]
Chinese New Year typically lasts around 15 or 16 days because it begins with the new moon that falls sometime between the end of January and the end of February, and ends on the following full moon.
Understand the moon phases and you can wager a pretty good guess for when the next full moon is no matter where we are in the lunar cycle. Here's how. The Moon Phases Explained, From the New Moon ...
The new moon represents the start of a new cycle, rebirth, and letting go. A team of astrologers unpack what to expect from each new moon in 2023.
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.
Lunar orbit inclination also determines eclipses; shadows cross when nodes coincide with full and new moon when the Sun, Earth, and Moon align in three dimensions. In effect, this means that the "tropical year" on the Moon is only 347 days long. This is called the draconic year or eclipse year. The "seasons" on the Moon fit into this period.