Why is the moon so garden in the Mid Autumn Festival, and why is the moon so round in the Mid Autumn

The moon revolves around the earth in an elliptical orbit, and it generally takes 29 and a half days to "walk" from a full moon to the next full moon, which is called a "synodic moon", and when "looking", the moon, the earth, and the sun are closest to a straight line, and the moon is also the roundest and brightest. The "pace" of the moon rotation is fast and slow, and the time of the moon's "looking" is different every month, and the probability is "the moon of fifteen and sixteen rounds".

In addition, the night of the Mid-Autumn Festival, the autumn is high and refreshing, the air is fresh, the transparency is high, and because our country is an agricultural country, the Mid-Autumn Festival, the end of the autumn harvest, is to enjoy and harvest and the season, everyone has leisure to reunite, play moon cakes, have time to admire the moon, psychologically give people the feeling that the moon is the roundest.

1. From a meteorological point of view.

At this time, due to the cold and dry air flow from the north, the warm and humid air that has been circling over our country in summer is forced to retreat, so the clouds and fog in the weather are gradually reduced, and the inclination of the sun is gradually larger, and the ground gets solar heat and gradually decreases, and the temperature will be lower day by day, and the autumn wind usually makes the water vapor lower and the air transparent. As a result, the night sky is usually brighter, and the moonlight is usually brighter.

2. From an astronomical point of view.

The moon is not always only in the middle of the year. Because the moon usually reflects the sun's light to brighten, so from the moon, the strength of the moonlight should be related to the size of the moon's reflective surface, and the moon's distance from the earth is related to the moon's distance from the sun.

And the Moon usually revolves around the Earth, and the Earth's orbit is elliptical. And the nearest location is not necessarily fifteen. The first day of the lunar calendar is usually fixed"Shuo"，"Look"It depends on the movement of the moon and usually occurs in the lunar calendar.

Ten. Five, sixteen, two days, or even seventeen (such as this year); In addition, the Earth's orbit around the Sun is also elliptical, and perihelion is generally on the lunar calendar.

Ten. January, December, not August.

What Mid-Autumn Festival is when the moon is the fullest.

First of all, from the perspective of meteorological principles, this is because the Mid-Autumn Festival is around the autumn equinox, the days and nights are almost the same time, and the moon is located in the eastward direction, which happens to be directly exposed to the sun in the westward direction, and receives the most sunlight.

Secondly, around the Mid-Autumn Festival, the moon moves to the celestial equator in the night sky, that is, above the earth's equator, when the moon is closest to the earth and reflects the most light to the ground. Therefore, the moon in the Mid-Autumn Festival looks the brightest and brightest.

People have joys and sorrows, and the moon is cloudy and sunny. For observers on Earth, each phase of the moon is a different beauty, and in order to distinguish the phases of the moon, we have given different moon phases their names as pleasant: crescent moon, upper waxing crescent, first quarter moon, upper gibbous moon, full moon, lower gibbous moon, lower quarter moon, waning moon.

Why the moon is the roundest on August 15.

On the first day of the lunar month, when the moon moves between the sun and the earth, the moon faces the earth with its dark side, and rises and falls with the sun, so people cannot see it. The phase of the moon at this time is called the "new moon" or "new moon".

After the new moon, the moon gradually moves out of the area between the earth and the sun, and then we begin to see a small part of the moon illuminated by the sun, like a curved eyebrow, so the moon phase at this time is called "the moon of the eyebrow". This "crescent moon" can only be seen in the western sky in the evening.

The moon has a profit and loss, and the bright moon of the Mid-Autumn Festival is the largest and roundest day of the year, so it is a special time point; On this day, the earth and the moon are in the same line, and the earth is sandwiched between the moon and the sun, and the combined force of gravity between the two reaches the maximum. This day is the fifteenth day of the eighth month of the lunar calendar, the full moon in the middle of the sky, the Mid-Autumn Festival in the world; Because of the tidal action of gravity, the body's qi and blood are the most abundant and the most changing.

In life, we can take this opportunity to amplify the happiness of the festival atmosphere, and in the middle of body cultivation, we must also take the opportunity of natural transformation to nourish the qi and blood sufficiently.

The calendar, also known as the lunar calendar, is based on the moon's orbit around the earth for one month. Due to the blocking of the sun's rays by the earth, we can only see the full moon around the fifteenth day of the lunar calendar in a month on earth. As for the Mid-Autumn Festival, the autumn is high and crisp, and the air is exceptionally fresh, so the ancients believed that the moon in the Mid-Autumn Festival was the roundest and brightest.

So there was the later Mid-Autumn Festival moon appreciation, which was extended to express the wish for reunion. It seems to be like this.

Every month of the lunar calendar is round, and the moon in the Mid-Autumn Festival will not be rounder and brighter than at other times.

I guess that the ancients were about to harvest in the autumn, and they could rest and enjoy the fruits of the year's work, so that the mood would be very comfortable, so it would be more pleasing to the eye to see the moon.

The moon itself is round. There are holidays. There is a delicious enjoyment. Then the moon will naturally be rounder.

According to meteorological experts, from a meteorological point of view, whenever this time, the dry and cold air blowing from the north forces the warm and humid air that has been circling over most parts of our country in summer to retreat to the south, and the clouds and fog in the sky are reduced, reducing the occlusion of the moon.

At the same time, the inclination of the sun becomes larger, the ground receives less solar heat, the temperature is lower day by day, the autumn wind reduces the water vapor, the relative humidity of the air is small, and the condensed dust is also less, so the air is transparent, the night sky is like washing, and the moon appears extraordinarily bright.

But from an astronomical point of view, the moon doesn't have to be distinct only in the Mid-Autumn Festival. The moon is bright when it reflects the sun's rays, and when the moon reflects the sun's rays on the largest and nearly circular, the moonlight should be the brightest, reaching its fullest at 19:13 on the fifteenth day of the lunar month in 2013. It can be seen that the saying that "the moon to the Mid-Autumn equinox is bright" contains a certain kind of sustenance and feelings of people.

Fifteen moon sixteen round:

The moon is cloudy and sunny, so that the cycle of the moon's waxing and waning is called a 'synodic month' in astronomy, that is, the cycle of the moon's movement. The average time experienced by such a cycle is days.

But this number is only an average. The speed at which the moon orbits the earth is sometimes a little faster, sometimes a little slower. Such a cycle can be as long as it is 29 days and nearly 20 hours more, and a shorter cycle may be only a few minutes longer than 29 days.

In addition, the standard of the lunar calendar is that "Shuo" must be the first day of the new year, and after "Shuo", it takes about 14 days and 18 hours to reach "Wang", that is, the time of the full moon. Therefore, if the "Shuo" is in the early morning of the first day of the new year, then the "hope" should be on the evening of the fifteenth; And when "Shuo" appears relatively late on the first day of the new year, "hope" will also be delayed.

Considering the above factors, due to the change of the synodic month, the full moon may occur on the 15th lunar month, the 14th or 16th lunar calendar, and even the 17th lunar month.