What problems should we pay attention to when observing the total solar eclipse?

Every time there is a total solar eclipse, I don't know how many people will just aim the camera at the sun during the non-total solar eclipse stage.

Medical experts point out that "solar retinitis" caused by long-term direct exposure to the ultraviolet and infrared rays of the sun is almost incurable. Macula is the most sensitive part of retina, which makes light converge and makes the image clear. Once burned, the macula can never be recovered. Pointing cameras, telescopes and other observation instruments directly at the sun will not only damage the lenses in the instruments, but also directly burn the retina by the optically concentrated sunlight.

In order to reduce a lot of ultraviolet and infrared rays in sunlight, please don't use it.

Sunglasses: This is one of the most dangerous methods to observe the total solar eclipse, and it is also one of the most easily misunderstood methods. Sunglasses and sunglasses are not specially designed for observing the total solar eclipse. Wearing sunglasses to directly observe the total solar eclipse will hurt your eyes.

Exposure film: This method has been used to observe the total solar eclipse before, but it is not recommended, because everyone's film production level and exposure are different, and the observation safety cannot be completely guaranteed.

Candles painted with black glass: this is also an early indigenous method, but there are still problems. Due to the uneven blackening degree and glass thickness, the observation safety cannot be completely guaranteed, and this method is not recommended.

Floppy disk magnetic core: same as candle blackened glass.

X-ray: this method has not been fully demonstrated and confirmed, and it is not recommended to everyone.

Water splashed with ink: Although the water splashed with ink becomes a black background, it will still reflect more sunlight to the observer's eyes, which will still be harmful to the eyes. Not recommended.

For the sake of eyesight safety, please use.

Special observation mirror: (or self-made observation equipment for professional dimming membrane filtration such as "Bader membrane")

Small hole imaging method: Punch a small hole in the paper with a needle, and observe the total solar eclipse through the projection of the small hole on another paper or other interfaces; In addition, two fingers can cross to form a small hole for observation.

Telescope projection observation method: after the sun passes through the telescope, it will be projected on the ground, and the total solar eclipse will be watched through observation projection. But don't watch the total solar eclipse directly through the telescope, which will lead to blindness in severe cases.

Welding goggles: There is a shop that specializes in welding goggles. However, it should be noted that welding goggles are different from sunglasses, and sunglasses cannot be used to observe the total solar eclipse.

On July 22nd, 2009, are you ready to watch the once-in-a-century total solar eclipse?

When observing the total solar eclipse, you should choose sunny areas as much as possible and pay attention to the safety of your eyes. Because the sun's light is one million times stronger than moonlight, it can't be seen directly with the naked eye or through a telescope without dimming equipment, otherwise it will easily cause retinal damage and even blindness. During the partial eclipse, it is safer to wear a pair of glasses for observing the total solar eclipse, or use a basin filled with ink to watch by reflection. When observing the total solar eclipse with a telescope, you must add a filter in front of the eyepiece or detector to avoid burning your eyes. During the total solar eclipse, you can watch it directly with the naked eye. Before shooting with a telescope, you should take a dimmer or filter.

Eating is very light, and this moment is visible to the naked eye.

Not at other times

In addition, you can't look directly at the place where you can't see the total solar eclipse.

The most convenient way to observe the total solar eclipse is to use the solar eclipse observation mirror.

At present, there are many kinds of eclipse observation glasses on the market, which are mainly used to filter visible light, infrared light and ultraviolet light. Open the Taobao website and search for "eclipse observation mirror", and thousands of messages will appear.

How to choose the observation mirror?

Qi Yong, general manager of Hangzhou Astronomy Technology Co., Ltd. said: "At present, the main material of the eclipse observation mirror produced by regular manufacturers is Budd film, which is also widely used in astronomy." With this kind of observation mirror, you can hardly see ordinary objects, only by looking at the sun can you see clearly. At present, the solar eclipse observation mirrors produced by Suzhou Xinda Company are mostly sky observation mirrors and Xingtelang, and the price is between 5 yuan and 8 yuan.

How to wear glasses?

Before starting the machine, carefully check whether the solar eclipse observation mirror is in good condition. If damaged, please stop using it immediately. Children must use it under the correct guidance of parents and teachers.

Wear observation glasses 30 minutes in advance to adapt to the dark environment in the initial loss stage. Everyone has this experience: when you walk from a bright place into a dark room, you can hardly see anything at first, and after half an hour, your vision gradually returns to normal. This is called "dark adaptation". When the total solar eclipse occurs, the sky and the earth will stage "Night arrival" in a very short time. Don't let dark adaptation ruin your total solar eclipse dinner!

Take off the camera 10 second before eating, so as not to miss the astronomical wonders such as "Bailey Pearl". Once you enter the photogenic stage, you need to wear glasses quickly to avoid burning your eyes with strong light.

The above practice is called "two to one".

Remember, rest for more than 30 seconds every 3 minutes, and don't watch the sun for a long time.