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"there is a good night in a year, when the sun shines brightly for thousands of miles." moon-watching is the highlight of every mid-autumn festival. astronomical science experts said that this year's mid-autumn festival will be "the full moon on the 15th and the 16th", and it will also be a "supermoon". friends who like to watch the moon can enjoy this big round moon on the night of mid-autumn festival and the night of the 18th.

xiu lipeng, a member of the chinese astronomical society and an expert in astronomy, said that the orbit of the moon around the earth is an ellipse, and its revolution speed is not uniform. when it is close to the earth, the moon's speed will be faster; when it is far from the earth, the moon's speed will be slower. the shortest time from the new moon to the full moon is less than 14 days, and the longest is more than 15 days. therefore, the time when the full moon appears also varies. the earliest can occur on the evening of the 14th day of the lunar calendar, and the latest can appear on the morning of the 17th day of the lunar calendar. the 15th and 16th days of the lunar calendar are the most common days, and the 16th day of the lunar calendar is the most common. therefore, there is a folk saying that "the moon on the 15th day is full on the 16th day".

last year's mid-autumn festival was "the moon was full on the 15th day of the 15th month", while this year's mid-autumn festival is "the moon was full on the 16th day of the 15th month", with the full moon at 10:34 on the 18th. coincidentally, like last year's mid-autumn festival, this year's mid-autumn festival is also a "supermoon".

"supermoon" is not an astronomical term, but essentially means "perigee full moon", which means that the moon is near perigee during the full moon, and its apparent diameter is larger than that of a normal full moon, and its brightness is also higher, but it is difficult to distinguish this difference with the naked eye. xiu lipeng said that "supermoons" are not rare and occur every year. there are four "supermoons" this year, and september 18 is the second one.

how to enjoy this "super mid-autumn moon"? "the best time to enjoy the moon is more than an hour after sunset. at this time, the moon has just risen and the buildings on the ground can be vaguely seen. against the backdrop of the moon, the moon will also appear particularly large and round." xiu lipeng said. according to xinhua news agency