How much do you know in September?Mid -Autumn Festival this year, the fifteenth moon of the fifteenth day

It's about to enter September soon. The weather is starting to cool down, the rainfall decreases, and the increase in sunny days is the good time for the stargazing to enjoy the moon. The following will introduce some special natural phenomena and important astronomical time nodes that will happen in September.

September 10th Mid -Autumn Festival full moon

August 15th of the lunar calendar is the Mid -Autumn Festival. This festival generally appears between September 7th and October 6th of the Gregorian calendar. This year's Mid -Autumn Festival is on September 10, coincided with Teacher's Day. The Mid -Autumn Festival is also known as the monthly festival, worship of the month, monthly mother festival, moon festival, reunion festival, etc., as the Spring Festival, Qingming Festival, and Dragon Boat Festival also known as the four traditional festivals in China. Since ancient times, the Mid -Autumn Festival has folk customs such as the moon appreciation, the moon sacrifice, and the moon cakes.

As the saying goes, "the fifteenth moon sixteen circle", that is, most of the full moon that appears in the 16th of the lunar calendar. However, the moon in August 15th this year is fifteen rounds, and the specific full moon time is 17:59 on September 10. The moon in Beijing rose on that day was about 18:50.

We know that the month of the lunar calendar is completely based on the changes in the monthly phase. The moon is the part of the moon that is seen by the earth by the earth. The moon revolves around Earth, and it does not shine itself. In mid -month, the relative positions of the sun, earth, and the moon are changing regularly, and the moon phase is constantly changing. This kind of profit and loss cycle of the moon is called the Shuangwang cycle, with an average time of 29.53 days. When the moon runs between the sun and the earth, the moon looks in the direction of the sun from the earth. Its dark side faces the earth. At this time One day that must be on the day of Shuo, because the monthly phase cycle is 29.53 days. In order to meet this regulation, the monthly monthly month is divided into large and small months, 30 days of large moon, 29 days of small moon, to ensure that the month on the day of the day is Shuo Shuo Shuo Shuo Shuo Shuo is Shuo Shuo that day is Shuo Shuo Shuo Shuo is Shuo Shuo that day is Shuo Shuo Shuo Shuo Shuo Shuo is Shuo Shuo that day. Essence

It takes about fourteen or five days from Shuo to the full moon, but the length of the time is not completely fixed. This is because the moon is running around the earth on an ellipse orbit. When it is running faster, when it is far from the earth, the speed is slower. Therefore, the shortest time from Shuo to the full moon is less than 14 days, with a maximum of more than 15 days. From the statistical data, the full moon mostly appears in the fifteen and 16th of the lunar calendar. Among them, the largest moon appeared in the sixteen, accounting for nearly 60%of the total, and the full month of the fifteen, accounting for about 40%. Therefore, there is a saying of "Fifteen Moon Sixteen Yuan".

September 11 Jupit

The phenomenon of Jupiter will occur on the evening of September 11. The moon that has just passed the full moon and Jupiter close to the sun will close together. The corner distance between the two is only more than 2 degrees. At 23:17. Jupiter's brightness is very bright, with -2.9, etc., Tianyi Black rises from the East to the ground, and then a round of bright moon will rise, Jupiter is on the left side of the moon. Over time, the horizon of the two gradually increased. After midnight, the moon and Jupiter run to the high altitude of the south. At this time, Jupiter at the top of the moon and the angle distance from the moon reached the closest.

Autumn equinox on September 23

There is an important time node in astronomical this month, which is autumnal equinox. Generally, it appears from September 22 to 24 of each year. The specific time of this autumn equinox is 9:04 on September 23.

The autumn equinox is the same as the spring equinox, summer solstice, and winter solstice. It is both an important node in astronomy and one of the 24 solar terms in my country. Twenty -four solar terms basically reflect the time of alternation of the four seasons and the laws of changes in nature in the year. It plays an important role in guiding agricultural production. Farmers can plant cultivation according to the solar terms to achieve good gains. Autumn is a great time to gain. Since 2018, the State Council has set up autumn equinox to the "Chinese Farmers Harvest Festival".

Twenty -four solar terms were invented and created by the ancient working people and astronomers in the ancient labor people and astronomers, and they were unique to the traditional Chinese calendar. As early as the Spring and Autumn Period and the Warring States Period, my country had been able to measure the length of the shadow of the sun at noon, to determine the four solar terms of the winter solstice, summer solstice, spring equinox, and autumn equinox. In the Qin and Han dynasties, there was a complete twenty -four solar terms, which has been in use to this day.

The earth moves around the sun, but from the earth, it seems that the sun is moving slowly. The sun walked in the sky in the sky for a year, and the astronomical line was called the zodiac by the route passing through the sky. The zodiac was a large circle of 360 degrees. This large circle was divided into 24 sections. East has a solar term every 15 degrees. In the year, the zodiac will cross the heavenly equator twice, once in the spring equinox, and once in the autumnal equinox. Astronomy stipulates that the eclipse of the spring equinox is 0 degrees, and the ecstasy of the autumn points is 180 degrees.

Many people mistakenly believe that since the twenty -four solar terms are the unique tradition of China, they should be formulated based on my country's unique Yin and Graduate calendar -the lunar calendar. In fact, the twenty -four solar terms should belong to the category of the solar calendar. It is determined by changes in the sun in the sky. The ancients were divided into twenty -four solar terms based on the sun's visual movement. It should be noted that the year here is not the year of the lunar calendar, but the return year of the solar calendar. The twenty -four solar terms are now in our universal Gregorian calendar, the date is basically fixed, and it is not a day or two.

Autumn equinox is the fourth solar terms in autumn. On this day, the sun is direct to the Earth's equator, and the day and nights around the world are divided. During the year, the sun's rising and falling position changes every day. In the summer, the sun is directly north of the equator, the sun rises from the north to north, and the height of the sun is high at noon. In winter, the sun is direct to the south of the equator, the sun rises from the south of the east, and falls in the south of the south. The height of the sun is low at noon. During the spring equinox and autumnal equinox, the sun was directly echoed in the equator, and the sun rose from the east, and fell from the west. If you do not consider the impact of the atmosphere, it is almost a matter of day and night. Jupiter September 27th

On September 27, we will usher in Jupiter. When rushing to the sun, Jupiter is located in Pisces, and the brightness reaches -2.9 and so on. Jupiter rushes to the earth when the earth just runs between Jupiter and the sun. At this time, Jupiter, the earth, and the sun are on a straight line. From the earth, Jupiter and the sun differs by about 180 degrees in the sky, which is the largest angle. when. The distance from Jupiter to Earth during the day, the brightest brightness and the largest diameter. Tiantian Black Jupiter rose from the East Horizon. It was located in the south at midnight. The height reached the highest height. During the morning sunrise, Jupiter fell from the western horizon and appeared in the sky all night. It was the best time to observe it.

Jupiter is the second bright star in the sky. Its brightness is second only to Venus, which is brighter than other planets and stars. Only Mars will exceed Jupiter in a short time in a short time. Jupiter not only radiates dazzling light, but is also the largest planet in the solar system, which is twice that of the total quality of all other planets. Observe Jupiter with a small astronomical telescope, we can clearly see the four brighter satellites around Jupiter. More than 400 years ago, the Italian astronomer Galileo found them when he observed Jupiter with a telescope and determined that they were the satellites around Jupiter. Therefore, these four satellites are called Galileo satellites.

Source: Science and Technology Daily

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