On the day of summer solstice, you can see the observation guide of annular eclipse.

This year, one of the most important astronomical phenomena-annular solar eclipse will appear on the solstice in summer, which can be seen by all departments and regions in China. This annular eclipse is very rare. For better observation, let's use astrological knowledge to reveal the observation guide of annular eclipse from next summer to the sun!

In summer, you can see a solar eclipse. On June 2 1 this year, the solar eclipse will be staged in the sky of China. This will be the first time that China has witnessed an annular solar eclipse in eight years. If we miss this opportunity, we will have to wait another ten years to see the annular eclipse in China. On June 2 1 day, an annular eclipse occurred, with a maximum food score of 0.994. The apparent radius of the sun is15min 44.23s, and the apparent radius of the moon is15min 24.18s. The difference between the two is 20.05 seconds. Usually, people's naked eyes can see and distinguish objects with an opening angle greater than 60 seconds, so they can see transit of venus, because the maximum apparent diameter of Venus can reach 60 seconds. But the transit of mercury is invisible to the naked eye, because the maximum apparent diameter of mercury is only 12 arc seconds. In this annular eclipse, the width of the halo exposed by the moon covering the sun is only 20.05 seconds, which is smaller than the apparent diameters of Venus and Jupiter seen by the public. This halo width is called "Phnom Penh solar eclipse" and most people have never seen or photographed it. The halo widths of the two previous annular eclipses in China were 64.77 arc seconds on May 2 1 day, 20 10 and 9 1. 19 arc seconds on May 2 10. According to reports, during the annular eclipse on June 2 1 this year, most parts of southern China were in flood season, with more rainy days. In western China, the probability of sunny days is higher, while in eastern China, the probability of rainy days is higher.

The observation conditions in different areas have their own advantages and disadvantages. Eclipses can be divided into partial eclipse, annular eclipse and total eclipse. "This eclipse in Phnom Penh is an annular eclipse, and the food is very close to 1. Whether it is a total solar eclipse or an annular solar eclipse, there will be a partial solar eclipse before and after their formation. " Qu Zhongquan, a researcher at the Yunnan Observatory of the Chinese Academy of Sciences who has been engaged in solar physics research for many years, told the Science and Technology Daily reporter. The better observation site is in India, but in China and Tibet, the observation effect is also good. The annular food belt observed in Ali, Tibet is only 20 kilometers wide, while it is only 40 kilometers in Fujian and Taiwan Province provinces. The eclipse in Phnom Penh is fleeting. The duration of the annular eclipse in Tibet is only 40 seconds, and the annular eclipse near the eastern center line does not exceed 1 minute. Such a short and spectacular astronomical phenomenon must be arranged in advance if you want to observe it. The food belt passes through parts of East China, and the traffic is relatively convenient, but the probability of sunny days this season is small; The transportation on the Qinghai-Tibet Plateau is inconvenient, but it is more likely to encounter good weather.

Observation point: astronomical name: Phnom Penh solar eclipse data: the solar eclipse reached 0.994, that is, the sun was almost completely blocked by the moon. Food Belt Path: The circular food belt will enter from Yongcuo, Mabian, the holy lake in Tibet, pass through the southern Sichuan Basin, enter Fujian via the northeastern Guizhou and southern Hunan and Jiangxi provinces, enter the sea in Xiamen, Fujian, and finally leave China via Taiwan Province Island. Eclipse time: June 2 1 day 14: 40, and the eclipse will reach its maximum; The first loss of contact occurred from west to east at about 13:30~ 15:00 Beijing time, and the eclipse time was about15: 00 ~16:15, and then the last contact was at15. Observation range: The width of circular food belt is only 20km in Ali, Tibet, and only 40km in Fujian and Taiwan Province provinces. Observation time: the duration of the annular eclipse in Tibet is only 40 seconds, and the annular eclipse near the eastern center line does not exceed 1 minute.