[Commentary] After the "big man" Jupiter "sunrise" of the solar system on July 14, Saturn, which has the reputation of "Lord of the Rings", will also perform the "sunrise" show on July 21. The public will rely on the naked eye or small astronomy The telescope can see the beautiful style of Saturn.

　　[Explanation] Saturn is one of the most beautiful planets in the night sky. It is the farthest from the earth among the large planets that are easily visible to the naked eye. To the naked eye, it appears as a bright yellowish celestial body; in the telescope, it looks like a straw hat.

　　[Same period] Hu Fanghao, Engineer, Science Department, Purple Mountain Observatory, Chinese Academy of Sciences

　　The definition of Saturn's "sunburst" is actually Saturn and the Sun's retinues are 180 degrees apart. A simple understanding is that Saturn, the earth and the sun are aligned in a straight line. The earth is in the middle. Since both Saturn and the earth are constantly moving in orbit, the "sunset" corresponds to a certain moment. This time the "sunset" is 5:33 on July 21.

　　[Explanation] The same giant gas planet, Saturn is much darker than Jupiter, but Saturn is no less concerned than Jupiter, because it has a wide and beautiful halo.

　　[Same period] Hu Fanghao, Engineer, Science Department, Purple Mountain Observatory, Chinese Academy of Sciences

　　On the day of the "sunset", when the sun sets, Saturn will rise from the southeast, and it will fall southwest at sunrise and can be seen all night. Of course, not only on the "sunset" day, but also a period of time before and after the "sunset" is a good time to observe Saturn, so you can choose a sunny night in the summer and take the beloved telescope to enjoy the beautiful outdoors The "straw hat" planet. After enjoying Saturn, you can also take a look at Jupiter, who is inseparable from Saturn this year.

　　[Explanation] It is understood that Saturn's revolution period is 29.5 years, and the rendezvous period is 378 days, which is 1 year and 13 days. Therefore, the date of Saturn's "sunburst" is delayed by about 13 days each year from the previous year.

　　Reporter Ge Yong from Nanjing, Jiangsu

Editor in charge: [Li Yuxin]