On June 2 1 day, a rare solar eclipse will be staged in the sky. Annular eclipse is a kind of solar eclipse. When it happens, the central part of the sun is dark, and the edge is still bright, forming a halo. In the face of this rare spectacle, everyone must want to feast their eyes, but if they don't pay attention to the safety of viewing, it will do great harm to their eyes. What should they pay attention to when watching? What observation tools do I need to buy?
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On June 17, the reporter learned from the Purple Mountain Observatory of Chinese Academy of Sciences that on the afternoon of June 2 1, an "annular eclipse" with excellent viewing effect will be staged in Tianyu. At that time, the central part of the sun was dark, but the edge was still bright, forming a dazzling "golden ring" in the sky, which was very spectacular.
Hu Hu, an engineer from the Science Department of Purple Mountain Observatory, Chinese Academy of Sciences, said that the "food score" of this "annular eclipse" is very large, and the highest "food score" in China can reach 0.995, which is almost close to the total lunar eclipse. Although it is not as spectacular as the total solar eclipse, the annular solar eclipse is also wonderful. China's "annular eclipse" is in an excellent observation position, including Tibet, Sichuan, Guizhou, Hunan, Jiangxi, Fujian, Taiwan Province and other places.
1, which can't be directly watched by naked eyes. Select the appropriate filter.
The most important thing to observe the annular eclipse is to protect your eyes. Although the sun is partially blocked, only 65,438+0% of the sunlight area is more than the light emitted by electric welding. Studies have found that if you look directly at the sun for a little longer, it will lead to macular burns and produce "solar retinitis." Once burned, the macula of the retina will never recover. You may not feel anything when you are injured, but after a few hours, you will have adverse reactions, and in severe cases, you will even be permanently blind.
When observing the annular eclipse, you should use special eclipse glasses, electric welding glass with the coefficient of 1 1, and two layers of black and white negatives should be exposed and washed. At the same time, you should pay attention to not watching the sun for more than 20 seconds at a time.
2. Rational use of binoculars
In order to watch the annular eclipse more closely and clearly, many people will use telescopes, but it is also very dangerous. Telescope will generate high heat when concentrating light, so it is necessary to install appropriate dimming equipment for the telescope to protect both eyes from damage. The safe way is to project the sun onto a white screen or paper. In addition to the position of the screen should not be too close to the focus of the telescope, the observer himself should not be too close to the screen or telescope tube to avoid burning the screen or paper because of the spotlight of the telescope.
3. Using the principle of "pinhole imaging"
People without binoculars can drill a small hole with a pinhole above the carton, lay a layer of white cardboard on the bottom of the carton, and open an observation window on the side of the carton. When observing, aim the small hole above the carton at the sun, and observe the reflection of annular eclipse on the white bottom plate in the carton from the window. The principle is "pinhole imaging".
4. Choose a suitable viewing place.
The best places to watch the annular eclipse are high places where the sun can set, such as the top of the mountain and the roof. If you are in a high-rise building, you can watch it from the balcony or the window facing west.
If you want to take a good photo, it is best to choose a good location two days before the appearance of the annular eclipse and measure the exposure of the shooting day in advance.