Turn off the lights for an hour, we count the stars together
Kant said: There are two things in the world that can deeply smash people's hearts. One is the lofty moral code in our hearts, and the other is the splendid starry sky above us. However, if we look up, the sky has been polluted by urban lighting into orange-red, and it is difficult to find beautiful stars.
This year is the International Year of Astronomy. China will appeal to the public to participate in the Earth's one-hour light-off event. It will focus on climate change, energy conservation and emission reduction by extinguishing lights and turning off power, and promoting dark night awareness.
Please turn off the lights for one hour on March 28
It is understood that an important theme of the United Nations International Year of Astronomy this year is the dark night consciousness. Reducing nighttime lighting not only saves energy, reduces light pollution, but also helps healthy sleep, protects wildlife, and opens a window of communication with the universe.
Li?F, a teacher of the Department of Astronomy at Nanjing University, told reporters that this year’s Earth’s one-hour blackout event has been planned three times, so that everyone can participate in the stars and recognize the stars, reminding everyone to pay attention to light pollution. The first time was on March 28th, the World Wide Fund for Nature launched a collective action against climate change. The event time was from 8:30 to 9:30 pm Beijing time, calling on people to turn off the lights and turn off the power during this hour. . The second event was on June 21st, the day of the summer solstice, and the beginning of the peak summer electricity season. The landmark buildings in many Asian cities will be turned off for one hour. The third event was arranged on August 22nd on the eve of Qixi Festival. Qixi Festival is a traditional festival in China. At the same time, Asian countries such as Japan and South Korea also have the tradition of Tanabata. In the one-hour blackout event that will be carried out that day, it will be in the light-off interval. Organize star recognition and stargazing activities.
Light pollution makes Nanjing lose dark night
When night falls, the lights in the city will light up in turn. In addition to home lighting, neon lights, street lights, and headlights shine brightly in the city. The orange smog is scattered all over the city. At 8 o'clock last night, the reporter looked at the night sky at Xinjiekou and tried to find the stars. He found the radiant city sky, like a gray cloth, without any embellishment.
Li?F told reporters that in Nanjing, more than a decade ago, the stars of the stars that people can observe with the naked eye are 6, etc., and now the stars with a brightness of 3 are observed, and they are barely able to see them. People can only find the brightest Venus in the sky. The larger the value of the visual star, the darker the star we see. For every increase in a star, it is equivalent to a 2.5-fold increase in brightness. This means that in the past decade or so, the sky brightness in Nanjing has increased by about 8 times.
The telescope of the Pukou Observatory of Nanjing University is the largest caliber (65 cm) optical telescope in downtown Nanjing. Even this telescope has a cataract. In December, when the weather is the coldest and the observation conditions are the best, you can barely see stars such as 14 to 15 stars. This level is relatively low for optical telescopes.
Night is not black, brain white gold can not be secreted
People live in the city that never sleeps. When the balance of day and night is broken, the body has to pay the price. You know that melatonin is a tonic. In fact, the brain itself can secrete melatonin, which is the famous melatonin. The night is not black enough, and the function of the brain to secrete melatonin is degraded. Li?F said.
Medical experts told reporters that melatonin is a melatonin secreted by the pineal gland in the human brain. Only at night, in the dark environment, melatonin can be secreted normally. Now, due to exposure to light at night, the human visual system is stimulated and the secretion of melatonin is inhibited.
Experts told reporters that melatonin is closely related to the biological rhythm of human sleep and body temperature, that is, the light in the night, which disturbs the rhythm of the human body to some extent. Studies have shown that when the balance of day and night is broken, people are closer to prostate cancer, enlarged prostate, diabetes and depression.
A light box kills 350,000 insects
Li? F said that the key to seeing the starry sky is that the nighttime light pollution will endanger the survival of animals and plants. Street lamps and light box advertisements make many insects unable to survive, and strong lighting brings many harms to insects. At the same time, the reduction in the number of insects caused birds and bats to find enough food. In addition, many plants that rely on insect pollination will also be affected to varying degrees. According to statistics, a small light box kills 350,000 insects every year, which directly affects small animals that feed on insects and plants that are pollinated by insects.
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