News on November 15, 2016, "The super moon happens once in nearly 70 years. If you miss it, you have to wait for another 18 years!", "The largest super moon landscape of the 21st century will appear in many places around the world!"... 7:21 last night , the moon is closest to the earth all year round. About half an hour later, the long-awaited "super full moon" will arrive as scheduled.
Look up at the biggest moon
Question 1
Is " super full moon " rare?
Are "super moons" really rare? Dr. Wang Yumin of the Ancient Observatory told reporters that the so-called "super moon" is a state when the moon is close to the earth, that is, the full moon (or new moon) and the periapsis moon occur at the same time. In fact, the moon revolves around the earth 12 times in a year and passes perigee every month. However, its orbit is not fixed. It may reach 350,000 kilometers at the latest, and usually is between 360,000 and 370,000 kilometers. Therefore, This phenomenon is relatively common.
And when the time between the full moon and its perigee is relatively close, the "super full moon" will appear particularly large. "This time the moon passed perigee and the full moon was separated by more than two hours. It is indeed the closest the full moon has been to perigee since 1948."
However, astronomy does not stipulate how many kilometers from perigee the full moon is rated as a "super full moon". The full moon and perigee occur every year. For example, the full moon will be at 12:33 on October 16 this year, and the moon will pass perigee at 8 a.m. on the 17th. The difference between the two is less than 20 hours, and it can be regarded as a "super moon." One month later, at 7:00 a.m. on December 13, the moon passed perigee and became full moon at 8:05 a.m. on the 14th. The difference between the two was less than one day, and the "super moon" will also be exceptionally large and round.
"Super Full Moon" attracted millions of people to watch
Question 2
The diameter of the moon increased by 14%?
Many media reported that this super moon will look 14% larger than usual and its brightness will increase by about 30%. How was this data obtained?
Wang Yumin said that the diameter of the moon is fixed, but when the distance from us is different, the diameter of the moon's angle to us can be calculated using trigonometric functions. The maximum diameter is 14% larger than the minimum diameter. This "supermoon" is 350,000 kilometers away from the Earth, and the maximum distance is 405,000 kilometers. The ratio of 35 to 40.5 is about 86.4%. The distance is shortened by 14%, and the diameter seems to have increased by 14%.
"The data are correct, but the original base number is too small. The increase looks amazing. In fact, it is difficult to distinguish with the naked eye." Wang Yumin pointed out that the moon appears particularly large when it rises. The higher it is, the smaller its diameter is. The difference can be 100% to 200%. "The 'illusion' of the human eye has long concealed the changes of the 'super full moon'."
Question 3
Are the moons bigger?
"It doesn't matter if it's super or not, I just want to see the moon!" Last night, the super moon was all over the Internet social platforms: the Yellow River reflecting the moon in Ningxia, the turret hanging moon in the Forbidden City in Beijing, the moon rising over the Potala Palace in Lhasa ...At the same time, many netizens became very enthusiastic about poetry.
Sina Weibo Global Relay broadcast live broadcast of the "Super Full Moon" in the United States, Australia, Beijing, India, South Africa and other places around the world. It attracted millions of viewers in just one hour, and more than 3.5 million people watched the live broadcast five hours later. Soon after, the live broadcast on Sina Weibo turned into a "wishing wall": "I wish my parents a long and healthy life", "I hope I can grow ten centimeters taller", "I hope I will be single soon", "I hope the college entrance examination will go well next year"... ...and the "anchor hall" of Tencent Live has become a "confession wall": "Aunt, uncle, I miss you", "Girl, do you know that daddy misses you?"...
"Is it older than usual? I didn't watch it Come out, what I see is a feeling!" One netizen concluded.
Source: Beijing Evening News Beijing Evening New Vision Network Reporter Sun Leqi Liu Ping Photo
