Why is the moon sixteen round

The sixteenth circle of the moon on fifteen is an astronomical phenomenon. The reason is that the standard of the lunar calendar is that the new year must fall on the first day of the new year.

The moon is at its fullest and brightest when it is "looking". What is "Hope"?On the first day of the lunar calendar, the moon moves between the earth and the sun, and the illuminated hemisphere of the moon carries the earth on its back, and we cannot see the moon, which is called "new moon", also called "new moon"; It's time for the lunar calendar.

Ten. On the fifth and sixteenth, the bright side of the moon is all facing the earth, and we see the round moon, which is called the "full moon", also called "hope". According to the lunar calendar, this day is the first day of the month. But on the same new day, the new moon may occur in the early morning or at night, and each synodic month itself has its own length and shortness.

In this way, the "hope" of the moon's fullest hour can occur as early as the early morning of the 15th and as late as the morning of the 17th. As we all know, the lunar calendar is based on the law of the moon's orbit around the earth, so it corresponds to the moon very accurately. But the lunar calendar is a combination of the advantages of the lunar calendar and the solar calendar, which will inevitably have errors, when people put the beginning of the lunar calendar must be "Shuo", "Wang" depends on the movement of the moon, usually, it will appear in the lunar calendar.

Ten. Five, sixteen and two days. The root cause of the late arrival of the Full Moon is caused by the unconstant speed at which the Moon revolves around the Earth. Disturbed by hundreds of factors, the speed of the Moon's orbit around the Earth is sometimes fast and sometimes slow, from "Shuo" to "Shuo" or from "Wang" to "Wang", the average cycle is days, but the difference between the longest and shortest periods is 13 hours.

If the "footsteps" of the moon are slow before "looking", it may take 16-17 days to travel from "Shuo" to "Wang", so there will be "15 moons and 16 rounds, or even 17 circles". "Wang" appears in the lunar calendar.

Ten. Five, ten.

In recent years, there has been the situation that the seventeenth month of the lunar calendar is the roundest, but no one pays attention to it because it did not catch up with the eighth lunar month where the Mid-Autumn Festival is located. - Encyclopedia.

Fifteen moons and sixteen rounds" What's going on?

Because the moon revolves around the earth in an elliptical orbit, when the moon and the sun are at 180 degrees longitude, that is, when the sun and the moon are in completely opposite positions, we see a full moon. As the Moon revolves around the Earth, it gets closer and closer, and the shape of the Moon as we see it changes constantly.

Why is the moon of sixteen rounder than fifteen

When the moon moves directly on the earth and the sun, when we can't see the moon, we call it a crescent. When we see half a moon in the sky, and the moon turns 90 degrees again, it is called "looking". When the Moon and the Sun are on opposite sides of the Earth, the Moon we see is the roundest, also known as the Full Moon.

After orbiting the Earth, the Moon goes through a cycle from the position of the New Moon to the position of the New Moon, which is about days. It takes about fifteen days to move from the position of the new moon to the position of the full moon. The new moon is the first day of the lunar calendar, but the speed of the moon is not fixed, and the time of the full moon may be 15 or 16.

Because there is no fixed time to "see" the early sunset, it may be fifteen or sixteen, so we can see the moon at 16 more than 15 rounds, and then through statistics, we can find that in the 100 years from 1950 to 2050, there were 39 times when the moon was 15 round, 48 times 16 times, and 13 times 17 times.

Fifteen moons and sixteen rounds" What's going on?

At that time, the rotation of the earth was on the same line as the revolution of the moon.

On the first day of the lunar calendar, the moon moves between the earth and the sun, and the illuminated hemisphere of the moon carries the earth on its back, and we cannot see the moon, which is called a "new moon"; On the fifteenth day of the lunar calendar, the bright side of the moon is all facing the earth, so we see the round moon, which is called the "full moon", also called "hope". Since the lunar calendar is based on the moon's orbit around the earth, it will be very accurate. The lunar calendar has 12 months of the year, and on the fifteenth day of each month, the moon is rounded once.

But why is it so bright from the moon to the Mid-Autumn Festival?

From a meteorological point of view, this is because at this time, the cold and dry air currents blowing from the north force the warm, moist air that has been swirling over most parts of the country in summer to retreat southward, and the clouds and fog in the sky are reduced. At the same time, the inclination of the sun gradually increases, the sunlight and heat obtained by the ground gradually decreases, the temperature is getting lower day by day, the autumn wind reduces the water vapor, and the air is transparent, so that the night sky is like a wash, and the moon is exceptionally bright.

Of course, this is also relative. From an astronomical point of view, the moon is not necessarily only visible in the Mid-Autumn Festival. Because the moon is only bright when it reflects the sun's light, from the perspective of the earth, the strength of the moonlight is not only related to the size of the moon's reflective surface seen by the earth, but also related to the distance of the moon from the earth and the distance of the moon from the sun.

The moonlight should be the brightest when the moon reflects sunlight on the largest and nearly perfectly round.

However, the moon's orbit around the earth is elliptical, and the perigee is not necessarily the fifteenth, the beginning of the lunar calendar must be "Shuo", and the "hope" depends on the movement of the moon, usually appearing on the tenth day of the lunar calendar.

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

January, December, not August. It's just the tenth of the month in the cold winter.

1. Who would be in the mood to run out and stand in the cold snow to watch the moon in December? So in August, I was lucky to be elected.

According to the data, it can be seen that the roundest moment of the Mid-Autumn Festival moon has the highest probability of appearing on the sixteenth day of the lunar calendar, which is the so-called sixteenth round moon of the fifteenth.

When the moon moves in the opposite direction to the sun to the earth, we can see a full moon, which is called "looking".

When the moon moves between the earth and the sun, the half of the moon illuminated by the sun is exactly facing away from the earth, and we don't see it.

Seeing the moon, this is called "Shuo".

From "Wang" to "Wang", or from "Shuo" to "Shuo", it takes an average of 29 days, 12 hours and 44 minutes, which is called a synodic month.

Shuo must be on the first day of each month of the lunar calendar.

After the new year, it takes an average of 14 days, 18 hours and 22 minutes to look at the moon, so the moon often does not occur on the night of the fifteenth, but on the night of the sixteenth, as the saying goes: "The moon of the fifteenth is sixteen round", which is the truth.

Since the speed of the moon's revolution around the earth is uneven, sometimes fast and sometimes slow, the length of the synodic moon can differ from its average by up to 6 hours, so the moon can also be delayed until the seventeenth night.

Of course, if the new year occurs in the early morning of the first day of the new year, then the hope will occur on the evening of the fifteenth, so there are also years in which the hope happens to occur on the night of the Mid-Autumn Festival.