When are the Spring Festival and Mid-Autumn Festival?

Spring Festival: On the first day of the first month, the moon is a new moon. At this time, the moon is located between the earth and the sun, facing the earth with its dark side, and appears almost at the same time as the sun, so it cannot be seen on the ground.

Dragon Boat Festival: On the fifth day of May, the moon phase is moth-eyebrow month. In the early evening of the month, it appears in the western sky, and the moon faces west, showing an anti-C shape.

Double Ninth Festival: On the ninth day of September, the moon phase is the first quarter moon. When the sun went down, the moon was already overhead and didn't set until midnight. At this time, the moon illuminated by the sun can only see half.

Mid-Autumn Festival: August 15, when the moon is full. The earth is between the sun and the moon, and the half moon illuminated by the sun faces the earth. At this time, we saw the full moon. Because the moon is just opposite to the sun, the sun sets in the west and the moon rises in the east. When the moon sets, the sun rises in the east, and a bright moon can be seen all night.

Extended data

Moon phase recognition

Assuming that the full moon is a circle, no matter how the phase of the moon changes, the connecting line between its upper and lower vertices must be the diameter of the circle (the phase of the moon is irregular during the eclipse). When the outer edge of the moon phase we see is close to the inverted C letter shape, then the moon phase at this time is before the fifteenth day of the lunar calendar. On the contrary, when the outer edge of the moon phase we see is close to the C letter shape, then the moon phase at this time is after the fifteenth day of the first month of the lunar calendar.

The phase of the moon is related to the tide of the ocean, because the tide is directly related to the gravity of the moon, for example, it will cause a spring tide during the full moon.

Tidal changes directly affect people's lives, such as military affairs, tourism, ocean navigation, marine fisheries, mariculture, marine engineering, scientific experiments and various coastal production activities.

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