The Monthly Cycle of the Moon's Phases

An interval of roughly thirty days separates one full moon or new moon from another. The two half moons, the first "quarter" when waxing and the third "quarter" when waning, complete the division of the month into quarters, which roughly correspond to our week. Near the sea it is noticed that the tides are exceptionally), high when the moon is invisible through the whole night (new moon) and when it is full. At first and third quarter (half moons) the high-water mark is exceptionally low. The most important thing connected with the changing appearance of the moon is that as the moon waxes and wanes it rises towards the east a little later every day. At first quarter it is already high in the heavens at sunset, setting about midnight. The full moon rises about sunset, is at its highest about midnight, and sets towards sunrise. At the third quarter the waning moon does not rise till about midnight, is seen at its highest point ("crosses the meridian") about sunrise, and is visible during the morning by daylight.

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