The causes of the full moon

The full moon refers to the moment when the ecliptic longitude difference between the moon and the sun reaches 180 degrees, and the full moon phase at this time

The moon-ground position relationship diagram. The position of 5 in the picture is when the full moon is full, the moon and the sun are on both sides of the earth. If it is directly opposite at this time, a lunar eclipse will occur. The full moon's diurnal motion is almost the same as the sun's diurnal motion in spring and autumn, winter and summer. It rises at sunset, is south-center at midnight, and sinks at sunrise. In summer, it can be seen rising from the southeast in most parts of China and lying low across the southern night sky. In winter, it is farther north, and the full moon in the south is higher in the night sky. During the vernal and autumnal equinoxes, it rises near due east and sets near due west. In the lunisolar calendar, the full moon must be around the 15th day of each month. Therefore, the fifteenth day of the lunar calendar is called "Wangri". The full moon has often become an object of appreciation, and moon-viewing activities have been held since ancient times. Especially the full moon in autumn is very beautiful. The 15th day of the eighth lunar month is called the "Mid-Autumn Festival". There are special moon-viewing activities in China, Japan, South Korea and other places. There are countless literary works with this theme. I don’t know if I can help you...but do it best for me, okay?

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What is the cause of the full moon? It's very simple, it's because of the waxing and waning phenomenon of the moon! The moon itself does not emit light; the moonlight we see is the result of its reflection of sunlight. In addition to its rotation, the moon also revolves around the earth at the same speed and direction. When it is between the earth and the sun and its light-receiving surface is not facing the earth, we cannot see the moon. This is called a "new moon" or "new moon". ", about the first day of the lunar calendar (the moon is at position A in the picture); when the moon moves to position B in the picture, only a small part of the light-receiving surface faces the earth, and we can see the eyebrow-shaped crescent moon; when the moon, the earth, and the sun Roughly at right angles (C in the figure), we can see half of the light-receiving surface of the moon, and the moon is a semicircular quarter moon. When the moon goes from C→D→E, we see more and more light-receiving surfaces of the moon, so we can see it changing from quarter moon to gibbous moon to full moon (around the 15th day of the lunar calendar). From then on, the light-receiving surface of the moon that we see decreases day by day, so the shape of the moon changes from waxing to waning, from full moon → gibbous moon → quarter moon → waning moon, and finally returns to the new moon. The moon's profit and loss cycle is about 29.5 days, so the "month" of the Chinese lunar calendar is set to 30 days for the big month and 29 days for the small month, so that the lunar calendar dates can match the synodic changes of the moon. On the first day of the lunar calendar, it is impossible to see the moon. On the third and fourth day of the Lunar New Year, I saw the Emei Moon. On the seventh and eighth day of the lunar month, I saw the first quarter moon. On the tenth day of the lunar month, the moon waxes. On the fifteenth day of every month, the full moon comes. *Due to the uneven movement of the moon, the full moon does not necessarily appear on the 15th day of the lunar calendar, but may occur one to two days earlier or later. Around eighteen, gradually losing weight. Twenty-two and twenty-three, the last quarter of the moon. Twenty-six and twenty-seven, the waning moon. It is because of the waxing and waning phenomenon of the moon that on the fifteenth day of the lunar calendar, the most illuminated surface of the moon is seen, so a round full moon is seen.

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After the first day of the lunar calendar

We see that the part of the moon that reflects sunlight will gradually increase

When the light-receiving side of the moon is completely facing the earth

it is a full moon. The two full moons are about thirty days apart.

Reference: General Knowledge Book 5th Grade (Absolutely Accurate )

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