What are Lunar Phases?

Moon phases, astronomical terms. (Phase of the moon) is an astronomical term for the part of the moon seen on Earth illuminated by the sun. As the moon moves a long distance from east to west in the starry sky every day, its shape is constantly changing. This is the phase change of the moon, called the moon phase.

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The phases of the moon are calculated based on the diurnal menstrual difference (the following degrees are the diurnal menstrual difference). Each phase of the lunar calendar has its own special name, as shown in the following table: ^[2]

The lunar calendar in astronomy mainly refers to the calendar arranged according to the moon phase cycle. One month is to use the moon to orbit the earth (using the sun as a reference, and the actual moon travels for more than a week) as a month, that is, using the new moon as the basis for determining the calendar month, and a year is divided into 12 calendar months. In agricultural meteorology, the lunar calendar is commonly known as the lunar calendar, the lunar calendar, the ancient calendar, and the old calendar. It refers to the summer calendar traditionally used in China. In astronomy, it is considered that the summer calendar is actually a yin and yang calendar. This is because the yin and yang calendars have additional lunar months, solar terms, and seasonal information in addition to the traditional lunar calendar. ^[1]