流星雨英文PPT(Meteor shower and its observation)
双语教学实例-Meteorology讲解学习
◆ There are also two minimum periods near the solstices, when the subsolar point moves farthest north and south from the equator. All latitudes between the tropic of cancer 23.5oN and the tropic of Capricorn 23.5oS have two maximum and minimum values .
The global radiation balance
◆ The earth constantly absorbs solar shortwave radiation and emits longwave radiation.
◆ The sun provides a nearly constant flow of shortwave radiation toward earth.
3μm) Longwave radiation ◆ Thermal infrared wavelengths (>3μm)
Characteristics of solar energy
◆ The sun does not emit all wavelengths of radiation equally
Electromagnetic Radiation
◆ Wavelength describes the distance
高三英语天文地理综合单选题40题
高三英语天文地理综合单选题40题1. The ______ is the largest planet in our solar system.A. EarthB. MarsC. JupiterD. Venus答案：C。
解析：Jupiter（木星）是太阳系中最大的行星。
Earth （地球）、Mars（（火星）、Venus（（金星）都不是太阳系中最大的行星。
在这个句子中，考查的是对太阳系行星相关英语单词的认知。
2. A solar eclipse occurs when the ______ comes between the Earth and the Sun.A. MoonB. JupiterC. SaturnD. Neptune答案：A。
解析：日食发生在月球（（Moon）位于地球和太阳之间的时候。
Jupiter（（木星）、Saturn（（土星）、Neptune（（海王星）与日食的形成无关。
这里主要考查天文现象中日食相关的知识以及这些天体的英语单词。
3. Which of the following planets is known as the "Red Planet"?A. MercuryB. MarsC. UranusD. Pluto答案：B。
解析：Mars（（火星）被称为“红色星球”。
Mercury（（水星）、Uranus（（天王星）、Pluto（（冥王星）不符合这个描述。
本题重点考查特定星球的别称对应的英语单词。
4. The distance between the Earth and the Sun is called an ______.A. astronomical unitB. light - yearC. parsecD. angstrom答案：A。
解析：地球和太阳之间的距离被称为一个天文单位（astronomical unit）。
light - year（光年）是光在一年中传播的距离，主要用于衡量恒星间的距离；parsec（秒差距）是另一种天文学上的距离单位，比天文单位大很多；angstrom（（埃）是非常小的长度单位，用于原子尺度等微观领域。
全英天文课资料 MeteorShower
Why do meteors have a streak of light??
As they travel through our atmosphere, meteors collide with air molecules that knock away materials and strip electrons from the meteor… When the stripped atoms recapture electrons, light is emitted… The color of the light depends on the temperature and the material being “excited.”
Specific Meteor Showers
Meteor showers occur on a regular basis throughout the year, but not all are visible in the northern latitudes & some are very weak and easily go unnoticed… Some of the more impressive showers throughout a given year are: Shower Avg. Peak - Quadrantids – early January - Lyrids – mid April - Perseids – early/mid August - Orionids – mid/late October - Leonids – mid November - Geminids – mid December ** Historically, the Perseids in August & the Leonids in November have been the most impressive meteor showers /meteors/images/18nov01_page3/ cordiale1.mov
一起来看流星雨-PPT课件
历史记载
流星雨的发现和记载，也是中国最早，《竹书纪年》中就有 “夏帝癸十五年，夜中星陨如雨”的记载，最详细的记录见于 《左传》：“鲁庄公七年夏四月辛卯夜，恒星不见，夜中星陨 如雨。”鲁庄公七年是公元前687年，这是 世界上天琴座流星雨的最早记录。 中国古代关于流星雨的记录，大约有180次之多。其中天琴 座流星雨记录大约有9次，英仙座流星雨大约12次，狮子座流星 雨记录有7次。这些记录，对于研究流星群轨道的演变，也将是 重要的资料。 流星雨的出现，场面相当动人。中国古记录也很精彩。试 举天琴座流星雨的一次记录作例：南北朝时期刘宋孝武帝“大 明五年……三月，月掩轩辕。……有流星数千万，或长或短， 或大或小，并西行，至晓而止。”（《宋书· 天文志》）这是在 公元461年。当然，这里的所谓“数千万”并非确数，而是“为 数极多”的泛称。
流星雨的古老传说
1。根据古老的说法“因为一颗星坠落就必须有一份灵魂补上 去，人死了，灵魂就升天，升天时也就把你的愿望带给上帝了。” 2。流星是偶然经过的，只有一天到晚放在心里的梦想才能抓 住那电光火石的一瞬。这样的愿望，才有最终实现的可能。 3。流星是撞入大气的星星，是“现在进行时”；满天星光， 不过是远古的星星的影子，是“过去时”，现在时的愿望当然要请 流星来帮助。 当然，这是古人对于科学了解不过的情况下的不科学地的说法， 身为有科学知识的现代人，应该对这类说法心中有数。当然这有一 定的科学依据，根据物理现象我们现在看到的某些星星的光经过几 十甚至几万光年的光，光年是很长的，所以我们看到的是几年前的 星星。
观测方法
流星雨的观测方法有以下几种：目视观测、照相观测、分光观测、 光电观测、电视观测、雷达观测、空间观测等。但业余爱好者多用目 视观测和照相观测。根据长期观测事实表明，天空流星的出现有一定 的规律，表现如下几点： 一、流星数与其大小有关，对于肉眼不能见的暗弱流星平均每降 低一个星等（ 因为星等数小的星更亮，所以天文学上习惯把星等数增 加称为降低），流星数平均增加2。 5倍。 即流星体质量越小，数目越 多。 二、在同一天中，流星出现的概率以黎明前为最大，傍晚时为最 小，即下半夜的流星比上半夜多。 三、在同一年中，下半年的流星数比上半年多，秋季的流星比春 季多。 尽管每天落向地球的流星数目由于观测手段不一，会有不同的 结果，但大体上能反映出一定规律是相仿的。
高考英语二轮阅读理解基础训练题9
语鹅市安置阳光实验学校高考英语二轮阅读理解基础训练题9Last night’s meteor(流星) shower left many people in the community dissatisfied and demanding answers. According to Gabe Rothsclild, Emerald Valley’s mayor, people gathered in the suburbs of the city, carrying heavy telescopes, expecting to watch the brightly burning meteors passing through the sky. What they found instead was a sky so brightened by the city’s lights that it darkened the light of the meteors passing overhead.“My family was so frustrated,” admitted town resident Duane Cosby, “We wanted to make this an unforgettable family outing, but it turned out to be a huge disappointment.”Astronomers---scientists who study stars and planets---have been complaining about this problem for decades. They say that light pollution prevents them from seeing objects in the sky that they could see quite easily in the past. They call on people and the government to take measures to fight against it.There is yet a population besides professional and amateur star observers that suffers even more from light pollution. This population consists of birds, bats, frogs, snakes, etc. For example, outdoor lighting severely affects migrating(迁徙的)birds. According to the International Dark-Sky Association. “100 million birds a year throughout North America die in crashes with lighted buildings and towers.”Countless more animals casualties(伤亡）result from the use of artificial lighting. Clearly, people enjoy the benefits of lighting their evenings, but some scientists think it can be harmful for humans, too. They worry that exposure to light while sleeping can increase person’s chances of getting cancer.Emerald Valley is only one community that is becoming aware of the negative effects of light pollution. For years, Flagstaff, Arizona, has enforced lighting regulations in its city in order to assist astronomers at the Lowell Observatory. Similar efforts have been made worldwide, and a movement is underway to remind us to turn off lights when we are not using them, so that other creatures can share the night.【文章大意】许多人想在晚上看流星雨，结果由于光线太亮，影响了他们的观看效果。
热点27 彗星以及流星与流星雨(原卷版)中考英语考前时事热点话题阅读
备战2022年中考英语考前时事热点话题阅读+题型专练热点27 彗星以及流星与流星雨一、阅读理解1Since ancient times, human beings have looked up at the night sky. Comets (彗星) and meteors (流星) flying through the blackness were seen as signs from the gods. They were used to tell the future of human lives.In 2013, a meteorite shower hit an area in Russia. It injured around 1,200 people. In ancient times, this would have been a strange and terrible experience. Today, thought, science offers simple explanations for the occurrence (事件).Meteorites are small pieces of debris (碎片) that float around in space. Sometimes, they come near a planet, such as Earth. When they enter our atmosphere, they often heat up and become very bright. This is why they are sometimes called “fireballs”. They are usually mad e of metals, such as iron (铁), and other minerals (矿物). The Russian meteorites were stony, with iron making up 10 percent of them.Meteorite showers, such as that in Russia, happen when a large meteor enters the Earth’s atmosphere and, due to heat, breaks up into small parts. Most of these are very small — smaller than a grain of sand —and so don’t even make it to the ground. But others can cause a lot of damage.The meteor in Russia weighed 10 tons when it entered our atmosphere, and broke up about 20-30 miles (30-50 km) above ground. The sky was filled with bright lights and loud noises. Many windows were broken. The damage cost Russia around 206 million yuan.1. What did people in ancient times think when they saw a meteorite shower?A. It was a wonderful sight.B. It was common in nature.C. They respected it as a god.D. They felt puzzled and scared.2. Which of the following is NOT true about meteorites?A. They float around in space.B. They often heat up when entering Earth.C. There are fires around them.D. They are usually made of metals.3. When a large meteor comes into the Earth’s atmosphere, ___________.① meteorite showers happen② it breaks up into small pieces③ it falls to the ground as whole④ it seldom causes serious damageA. ①②B. ①③C. ①④D. ②④4. Which topic does the story NOT talk about?A. How meteorite showers happen.B. How to stop meteorite showers.C. The meteorites in Russia.D. The damage meteorites can cause.2There are lots of objects that we see in the sky. During the day we see the sun. After the sunset in the evening, we see mostly the stars. Not all the lights in the sky that we see are really stars.Of course, we see the moon. Some of the other lights in the sky are planets(行星). Planets go around the sun like earth does.Sometimes we can see a shooting star. Shooting star looks like a star that is moving quickly across the sky. Some people believe that seeing a shooting star will bring them good luck. It's hard to find shooting star because they run fast.The correct name for shooting star is meteor(流星). Space has lots of little objects. These can be rocks in space from old planets. These objects can be very small, they are called meteorites(陨石). When meteorite gets close to the earth, it gets pulled towards the earth by gravity(重力). Earth is surrounded by atmosphere(大气层). Atmosphere is made up of air and clouds. Meteorite burns in the earth's atmosphere. This makes the short bright moving light in the night sky. A meteorite then turns into meteor.5. At night the sky is filled mostly with ________.A. the moonB. the planetsC. the starsD. the sun6. From the passage, we can know ________.A. all the lights in the sky that we see are really starsB. space has lots of little objects and they can be rocks from old planets.C. when a meteorite is near the earth, it gets pushed from the earth by gravity.D. shooting star looks like star that is moving slowly across the sky.7. How does a meteorite turn into a meteor? Please put the following sentences in order.①It is pulled towards the earth by gravity.②The burning gives off bright light.③A meteorite gets close to the earth.④It burns in the earth's atmosphere.A. ③④②①B. ③④①②C. ③①④②D. ③②①④8. Where can we probably read this passage?A. In a diary.B. In a science magazine.C. In an advertisement.D. In a novel.3BOOM! That’s a word we often use to describe a loud sound. It’s also part of the term “sonic boom (音爆)”, which is something that happens when air is pushed so strongly and quickly that it creates a loud noise.On March 20, a rare daytime meteor (流星) created a sonic boom over parts of the UK and France, according to Live Science. The meteor flew through the sky so fast that it could hardly be seen - but it could definitely be heard.So how exactly are sonic booms made? You can think of air as being like water. When something moves through water, you can see ripples (波纹). If the object moves very quickly, the ripples start to run into each other.The same thing happens in the air, even if it can’t be seen. When the object moves faster than the speed of sound, the air is pushed hard, and it compresses (压缩) like the ripples on water. This will create a sound wave that is very loud, which is a sonic boom.In fact, lots of things can make sonic booms. When you go to the park and see people play with whips and tops (鞭子和陀螺), you might hear a tiny sonic boom when they crack the whip. Aircraft that travel faster than the speed of sound can also make sonic booms.A strong sonic boom can cause damage to windows or buildings, although the possibility of this is very low, according to the US Air Force. The loud sound can also disturb (影响) people on the ground and even cause hearing loss. That’s why supersonic aircraft are only allowed in tim es of war.9. Which of the following wouldn’t cause a sonic boom?A. a meteorB. whips and topsC. supersonic aircraftD. water ripples10. In paragraph 3, the writer mentions water to ________.A. help explain how a sonic boom happens.B. describe what water ripples look likeC. prove that water can move like air.D. explain the differences between water ripples and sonic booms.11. According to the passage, a sonic boom is something that ________.A. happens when air is pushed softly and slowlyB. never appears as a loud soundC. may cause damage to your houseD. can be seen when it happens12. On which website can we probably read this passage?A. /historyB. /soundC. /powerD. www.airforcexom/aircraft4I’m Victor. On my seventh birthday, my mom gave me a book about stars. That was the beginning of my lifetime hobby.I always went outside with my mom on clean nights and looked at the sky. In different seasons. we saw different groups of stars. Sometimes we saw stars shooting brightly（明亮地）across the sky. How beautiful they were!Studying the stars was great fun for me . When I learnt a little about them, Iwanted to find out more and more. Now it is my job. I host a TV show called The Sky at Night. I use what I know to tell people about the stars in a great way. I am happy because my TV show started over 50 years ago, now it’s still popular.Now I am seventy-five years old. Actually, I think you can turn your hobby into your job too. Anybody can make their dreams come true. You just have to enjoy what you do!13. The underlined word “shooting” means .A. 飞过B. 闪耀C. 眨眼D. 唱歌14. “Studying the stars was great fun for me.”tells us .A. Victor was interested in starsB. Victor loved the book very muchC. Victor often saw different starsD. Victor loved his TV show15. The sky at Night is over years old.A. 7B. 50C. 65D. 7516. The writer wants to tell us that .A. hobbies are just jobsB. TV show helps us a lotC. we need to enjoy what we doD. reading is important in our life5If you look at the sky one night and see something moving and shining that you have never seen before, itmight be a comet (彗星).A comet sometimes looks like a star. Like a planet, a comet has no light of its own. It shines from the sunlight it reflects (反射). Like the earth, a comet goes round the sun, but on a much longer path (轨道) than the earth travels.If a comet isn’t a star, what is it then?Some scientists think that a large part of a comet is water frozen into pieces of ice and mixed with iron and rock dust and perhaps a few big pieces of rock. When sunshine melts (融化) the ice in the comet, great clouds of gas go trailing after it. These clouds, together with the dust, form a long tail.Many people perhaps have seen a comet. However no one knows how many comets there are. There may be millions of comets, but only a few come close enough for us to see.An Englishman named Edmund Halley, who lived from 1656 to 1742, found out a lot about the paths that comets take through the sky. Some comets move out of our sight and never come back. Others keep coming back at regular times. A big comet that keeps coming back was named after Halley because he was the one who worked out when it would come back again. Maybe you have ever seen Halley’s Comets because the last time it came close to the sun and the earth was in the year 1986. Then people all over the world were outside at night to look at it. You will probably be able to see Halley’s Comets when it comes near the earth again.17. A comet is like ________.A. sunB. moonC. sunlightD. the earth18. A large part of a comet is ______.A. water and rockB. water frozen into pieces of ice and mixed with ironC. ice, iron and rock dustD. only a few big pieces of rock19. Maybe many people _______.A. haven’t seen any cometsB. have seen all cometsC. have seen a comet at daytimeD. have seen a comet20. Some comets keep coming back ________.A. at any timeB. at noonC. at regular timesD. at daytime21. Halley’s Comets came back _____.A. in 1990B. in 1980C. in 1986D. in 19896Comets(彗星) are parts of our solar system. Like the planets, they go around the sun.But comets are not made of solid rocks like planets. A comet is a ball of dust, stones, and ice. Many people call comets dirty snowballs.The “snowball” may be only a few miles across. But when the sun heats the “snowball,” much of it is changed to gases. The gases spread out and form the comet’s head, which may be thousands of miles across.A comet moves fast in its trip around the sun. But when we see it, the comet does not seem to move. That’s because it is so far away. The moon moves fast, bu t when you look at it, you can’t see any motion(运动). That’s because the moon is far away.Each year astronomers(天文学家) discover new comets. Some of them are seen only once. They make one trip around the sun and then go away out into space. The sun’s gravi ty cannot hold them.Other comets, like Halley, keep returning. They have been captured by the sun. Halley’s earliest visit was probably 3,000 years ago. It may keep returning for another 3,000 years.But every time a comet goes around the sun, the comet loses part of itself. Gases and dust are pulled out of the comet. That’s why Halley is now dimmer（暗淡的）than it used to be. Next time it visits us, in 2062, it may be even dimmer. Each visit it may get dimmer and dimmer, until it finally disappears.22. What is this passage mostly about?A. Comets and the sun.B. Why comets are like snowballs.C. Who discovered the first comet.D. Facts about comets.23. How does the writer help the reader understand what a comet looks like?A. By telling about a famous one.B. By explaining how far away it is.C. By describing how fast it moves.D. By describing it as a dirty snowball.24. What is the most likely reason the writer wrote this passage?A. To give information about comets.B. To tell readers about famous comets.C. To explain the importance of comets.D. To encourage readers to look for comets.7The planets aren’t the only wanderers(漫游者) of the sky. There’re some things even farther and longer. Long after people were no longer afraid of planets, they still thought the comets(彗星) were bad objects that traveled in the sky. They were afraid that the comets would suddenly land on the earth and hurt them.But, in fact, even if a comet did hit the earth, nothing much happened. A comet is really a harmless （无害的）thing.Comets have round heads and long tails , and they are very bright. Sometimes they look like heads with long hair flying with them. That’s why they’re called comets. Comet means long-haired.Like the stars and planets, comets are far away. But we can know its size. The head of a small comet is as wide as the Pacific Ocean. And a big comet’s head is ten times as big as the earth. Its tail is millions of kilometers long. Then why wouldn’t the great big thing hurt us if it hit the earth? Because it isn’t solid. It’s thin like cloud. Its tail is nothing but bright gas. And its head is made of small pieces and they could not hurt the earth.Some comets can be seen for a few months. Then they go away. Some of them come back in a certain number of years. Some are never seen again.Perhaps these comets that never return have broken into pieces. For some______think that shooting stars(流星) are pieces of broken comets.25. People were afraid ________.A. comets are different from planetsB. comets travel in the skyC. comets are much bigger than the earthD. comets could hit the earth26. Comets have long tail like ________, so we call them comets.A. long hairB. round headsC. round dishesD. wide wings27. From the passage we know the tails of comets are made of ________.A. waterB. solidC. gasD. small stones28. The underlined word “astronomers”may mean ________ in Chinese.A. 心理学家B. 艺术家C. 天文学家D. 考古专家29. Which of the following is TRUE ?A. A comet is a kind of planets.B. Comets are all ten times as big as the earth.C. People can hardly see comets.D. Shooting stars may come from the broken comets.二、完型填空Maria Mitchell was born in 1818 during a time when many people thought that woman did not need to learn . But , Mitchel l’s father thought that both boys and girls should go to school . 30 , he tutored her at home as well as sent to her to school .Mitchell’s father , recognizing her interest in astronomy (天文学) at early age , encouraged her interest and taught her how to use a telescope . As an 31 , she worked as the first librarian at the Nantucket Atheneum library from 1836to 1856 , all the while still looking at the sky at night , studying the stars and the planets.In October 1847, Mitchel saw a bright star through the telescope . She was sure that she had 32 seen that star before. Excited , she ran to tell her father . She carefully wrote notes about the star. The next night , it looked as if the” star” had 33 . It also seemed to have a tail (尾巴)！Now , Mitchell was sure that she had found a comet , not a star.At eh time , the king of Denmark was offering a prize to the first person to find a comet that could only be seen through a telescope . Mitchell won the prize! It was a gold medal . But , she won something else too . She won people’s respect when they saw that she was 34 her work . Later , the American Academy of Arts and Sciences voted her in as its first female member .In 1856, a new college just for women opened . It was called Vassar College , and Mitchell became a professor there . She was the first female professor to teach astronomy , or the science of stars and planets . Because of her , female students learned that they could be scientists too . Women could make valuable 35 to help understand our world .30. A. Instead B. In addition C. So D. After all31. A. adult B. agent C. astronaut D. audience32. A. once B. never C. probably D. certainly33. A. disappeared B. fallen C. moved D. grown34. A. famous for B. honest about C. responsible for D. serious about35. A. decisions B. discoveries C. mistakes D. connections三、短文汉语提示填空请用适当的词完成这篇短文，每个空只能填写一个形式正确、意义相符的单词。
高考地理冲刺颠峰捷径第一讲天文观测(共41张PPT)
知识梳理：金星合月
金星合月，也就是金星和月亮正好运行到同一经度上，两者之间的距 离达到最近，它是行星合月天象中的一种。金星合月是行星合月天象中除 木星合月外观赏效果较好的。2019年12月29日傍晚，作为行星合月里最美 的一幕“星月童话”，金星合月将现身天宇。
知识梳理：极光观测
极光（Aurora），是一种绚丽多彩的等离子体现象，其发生是由于太 阳带电粒子流（太阳风）进入地球磁场，在地球南北两极附近地区的高空， 夜间出现的灿烂美丽的光辉。在南极被称为南极光，在北极被称为北极光。
知识梳理：月球观测
3、日全食是日食的一种，即在地球上的部分地点太阳光被 月亮全部遮住的天现象。日全食分为初亏、食既、食甚、生光、 复原五个阶段。由于月球比地球小，只有在月球本影中的人们才 能看到日全食。民间称此现象为天狗食日。
知识梳理：月球观测
4、月相：“人有悲欢离合，月有阴晴圆缺”，这里的圆缺 就是指“月相变化”：在地球上所看到的月球被日光照亮部分的 不同形象。
命题思路：天文观测
天文观测：观测天体的重要手段是天文望远镜。可以毫不夸 张地说，没有望远镜的诞生和发展，就没有现代天文学。随着望 远镜在各方面性能的不断改进和提高，天文学也正经历着巨大的 飞跃，迅速推进着人类对宇宙的认识。
天文学是一门古老而常新的自然科学，研究对象是宇宙的规 律。它是以观察及解释天体的物质状况及事件为主的学科。主要 研究天体的分布、运动、位置、状态、结构、组成、性质及起源 和演化。天文学与其他自然科学不同之处在于，天文学的主要实 验方法是观测，通过观测来收集天体的各种信息。因而对观测方 法和观测手段的研究，是天文学家努力研究的一个方向。不断改 进和拓宽天文观测的方法是天文学家和天文爱好者永无止境的追 求和使命，也是推动天文学发展的动力和源泉。
英文版二十四节气介绍 精美PPT
20XX
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THANK YOU
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小寒（Minor Cold） 1月5日或6日 Jan 5/6
The beginning of the coldest days of the year.
大寒（Major Cold）
Coldest period of the year in China.
1月20日前后 Jan 20
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2022 WINTER OLYMPIC GAMES
Ice and snow become to melt; the temperature is raising up. Rainfall is increasing.
惊蛰（Awakening of Insects） Weather grows warmer and warmer, most
3月5日或6日 Mar 5/6
The beginning of the hot weather.
大暑（Major Heat）
The hottest period of the year. The crops grow fastest, the drought, floods, storms frequently happen.
7月22日或23日 July 22/23
芒种（Grain in Ear） 6月5日或6日 June 5/6
The wheats ripe, time to sow the rice.
夏至（Summer Solstice） The longest day and shortest night. 6月21日或22日 June 21/22
小暑（Minor Heat） 7月7日或8日 July 7/8
areas in China will turn into Spring season.
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Leonid （狮子座） The Leonid meteor shower peaks around 17 November of each year.
Approximately every 33 years, the Leonid shower produces a meteor storm, peaking at rates of thousands of meteors per hour.
When you talk about meteor shower……
• romance • lucky • disappointed
When you talk about meteor shower……
• romance • lucky • disappointed • F4
• What is meteor shower? • How to observe meteor shower?
• The radiant point (辐射点)
The radiant of a shower is the point in the sky from which the meteors appear to come. Meteor showers are usually named for the constellation（星座） in which their radiant lies at the peak of the shower…
Meteor shower and its observation
By Liu Kai lklkmymym@
When you talk about meteor shower……
• romance
When you talk about meteor shower……
• romance • lucky
13 November, 1833 Heaven on fire!
ZHR>35,000 Each people could see 240,000 meteors during nine hours.
How to observe……
1.When? professional prediction
• ZHR • Whether • Moon • Equipment
How to observe……
• ZHR • Whether • Moon • Equipment
• Attitude
Good Luck and enjoy the meteor shower
The end
Tanks
How to observe……
• ZHR
if ZHR>= 50, you can have a try.
How to observe……
• ZHR • Whether
晴天钟 (7timer)
How to observe……
• ZHR • Whether • Moon
How to observe……
@北京天文馆朱进 @天象预报
How to observe……
1.When? professional prediction 2.Where? light pollution safety
How to observe……
1.When? professional prediction 2.Where? light pollution safety 3.Method? believe your eyes
Zenithal Hourly Rate （天顶每小时流星出现率） (ZHR) of a meteor shower is the number of meteors a single observer would see in one hour under a clear, dark sky.
Perseids（英仙座） The most visible meteor shower in most years is the Perseids, which peaks on 12 August of each year at over one meteor per minute.
Tears of St. Lawrence
Geminids （双子座）
This is one of the best meteor showers of the year and never seems to disappoint observers. peak on December 13/14 of 50-80 meteors per hour.
Fireworks
Long exposure photography
Comet 彗星
Iridium Flare 铱星闪光
• A meteor shower is a celestial event in which a number of meteors are observed to radiate, or originate, from one point small fragments of comet debris（彗 星残片） entering the earth’s atmosphere at extremely high speeds…when the Earth’s orbit （轨道） & the comet’s orbit intersect at same point.