Chinese name: Tropic of Cancer mbth: Tropic of Cancer Latitude? : (23 26 ′ 21.448 ″ n) Alias: approximate latitude from summer to daily line: 23.5 N (middle hemisphere): geographical significance of the northern hemisphere: it marks the arrival of summer solstice. Definition, cause of formation, crossing area, geographical significance, naming reason, landmark and tropic of cancer refer to the northernmost boundary where solar rays can directly irradiate the earth. The position of the Tropic of Cancer is not fixed, but varies within the range of 23 26'1north latitude. In middle school textbooks, it is roughly defined as 23.5. The Tropic of Cancer runs through Yunnan, Guangxi, Guangdong and Taiwan Province provinces from west to east. The tropic of cancer on the world map causes the earth to revolve around the earth's axis and the sun from west to east. The orbit of the earth's revolution is an ellipse close to a perfect circle. The plane formed by this ellipse is called the orbital plane, also called the ecliptic plane. The earth revolves around the sun and also rotates around the earth's axis. In this process, the earth axis is not perpendicular to the orbital plane (ecliptic plane), but inclined, with an included angle of about 66 34'. However, the tilt direction of the earth's axis remains unchanged in space (translation), so that the equatorial plane and the ecliptic plane are not coincident (not parallel) but inclined, and the included angle is the complementary angle of 66 34', that is, 23 26'. This included angle is called the yellow-red intersection angle. The latitude tangent to the great circle of the ecliptic plane on the earth's surface is the tropic of cancer, which is located in the northern hemisphere and the tropic of cancer in the southern hemisphere. Geographical location of the equatorial crossing area The Tropic of Cancer and the Tropic of Cancer are the northernmost latitudes (about 23 26 ′ n) where sunlight can be directed every year. They are located between the tropics and the north temperate zone, which is the dividing line between them. The position of the Tropic of Cancer is not fixed. According to scientists' observation, the Tropic of Cancer moves southward about 14m every year. From west to east, the provincial administrative units passing through China are: Yunnan, Guangxi, Guangdong and Taiwan Province provinces. In the terrain area crossed by China, the Tropic of Cancer passes through Yunnan-Guizhou Plateau, southeast hills and other major terrain areas in turn from west to east. The countries and regions passing through are from 120 W from west to east, and the countries passing through the Tropic of Cancer are Western Sahara, Mauritania, Mali, Algeria, Libya and Egypt (Africa) in turn; Saudi Arabia, UAE, Oman, India, Bangladesh, Myanmar, China (Asia); United States, Mexico, Bahamas (North America). A total of 16 countries and regions. Continents and oceans intersect: Africa, Asia, Oceania and North America. Oceans: Atlantic Ocean, Indian Ocean and Pacific Ocean. The Asian climate it passes through has tropical desert climate, temperate continental climate, tropical monsoon climate, plateau mountain climate and subtropical monsoon climate. The dividing line of the geographical temperature zone is the summer solstice every year (around June 22), where the sun can shine vertically. Then the direct point of the sun moves south. The area south of the Tropic of Cancer (excluding the Tropic of Cancer) to the Tropic of Capricorn (excluding the Tropic of Capricorn) in the northern hemisphere receives the most heat from the sun twice a year, forming a tropical zone. Therefore, the Tropic of Cancer is the dividing line between the tropics and the north temperate zone. The Tropic of Cancer marks the northern hemisphere's entry into summer. On the solstice of summer every year, the latitude of the direct point of the sun in the northern hemisphere reaches the maximum, and the height of the sun can reach 90. At this time, it is summer in the northern hemisphere. The days in the northern hemisphere are long and the nights are short. The arctic circle (including the arctic circle) is extremely daytime, the southern hemisphere is in the middle of winter, and the Antarctic circle is extremely night. Since then, the direct point of the sun has gradually moved southward, and it has been circulating between two latitude circle cities near 23 26' north latitude and 23 26' south latitude. So these two latitude circles are called Tropic of Cancer and Tropic of Capricorn respectively. The English name of the Tropic of Cancer originated more than 2000 years ago. When the sun shines directly on the summer solstice here, it is in the position of cancer in the zodiac and returns to its original place, so it should be called the Tropic of Cancer instead of the Tropic of Cancer. Because of the movement of the star, it moved to the position of Gemini. Landmark Many places in China have memorial buildings such as the Tropic of Cancer Monument, Square and Sign Tower. The following are some well-known administrative maps of China: The Tropic of Cancer Park in Xichou County, Yunnan Province is located at the west entrance and exit of Xichou County, just across a canyon from the county seat, with an altitude of 1.526m, which is the highest elevation symbol of the Tropic of Cancer in China. The main logo is called "Return Pavilion", which looks like a flying saucer, a pavilion and a tower. There are windows around the exhibition hall, and there is a circular skylight in the middle of the top, which corresponds to the center of the hall in the exhibition hall and is used to observe the direct sunlight from summer to sun. Yunnan Mojiang Tropic of Cancer Sign Garden covers an area of 1500 square meters, integrating astronomy, geography, plants, popular science knowledge, garden art and tourism culture. Taking the position of the Tropic of Cancer in 2038 AD (23 26' north latitude) as the main axis, the 500-meter section of the Tropic of Cancer is cut off, and the "Sun Road" and "Kuafu Chasing the Sun" are used as examples. Use the science museum to express the understanding of nature, life and sunshine, tell people about the cosmic world of cultural and technological development from ancient times to today, and accurately show the geographical position and changes of the Tropic of Cancer through technical means, so that people can "capture" the figure of the Tropic of Cancer here every summer solstice. The Tropic of Cancer passes through Mojiang County and is called "Tropic of Cancer City". The Tropic of Cancer Sign Tower in Daming Mountain, Nanning, Guangxi There is a Tropic of Cancer sign tower about two meters in Daming Mountain Scenic Area, Nanning, Guangxi, which is built on the roadside of the old logging yard in Daming Mountain and equipped with the Tropic of Cancer Science Promenade. Tropic of Cancer Park in Guiping, Guangxi Guiping Tropic of Cancer Park is an east-west arc building with a span of18m and a height of17.2m.. A globe with a diameter of 6m is supported at the top of the arc center, and there is a "peephole" with a diameter of 16cm in the middle of the globe, through which the sun shines directly on the map of Guangxi Zhuang Autonomous Region directly below. The sign is embedded with the tropic of cancer indicator line with a width of 5 cm and a length of more than 20 meters in the east-west direction. The Tropic of Cancer sign in Shantou, Guangdong Province is located on Jilong Mountain in Shantou. It is13.6m high and consists of three parts: base, column and soil model. The pedestal is Tiantan-style, divided into three floors, the first and second floors, the first and second floors, each with a height of1.33m, and each with nine steps. The top floor is 0.3 meters high and has only one step. The column is two "North" shaped bearing cement supports, with a height of 8.6 meters. No matter from which direction, it is obviously "north", which highlights the theme of the Tropic of Cancer. The earth model is supported by a hollow column with a diameter of 5 meters. Sphere is used to describe the outline of the world. Trademarks are Equator, Tropic of Cancer and South Arctic Circle. There is a stainless steel tube with a diameter of 24 cm, pointing to the zenith and perpendicular to the ground level, which runs through the surface of the earth model and is used to check the direct sunlight from summer to noon. Guangdong Fengkai Tropic of Cancer is located in Jiang Bin Park, Jiangkou Town, facing south. The base of the sign is 12m wide, the inner ring is shaped into a hemisphere with concrete, and the outer ring is shaped into a gossip with granite. Four inclined columns are supported on the concrete base to support the tower. The tower faces south, opposite to the "closed" position. The four inclined columns are located in four directions: Xun (southeast), Gen (northeast), Gan (northwest) and Kun (southwest). The lower part of the tower is poured with reinforced concrete, and the upper part of the tower is welded with stainless steel. There are two wings floating on each side of it, and the word "North" is displayed at any position, which means "Tropic of Cancer" and "Rockets soaring into the sky". A copper ball with a diameter of 62. 1cm is placed at the top of the tower, symbolizing the sun. There is a round hole with a diameter of 10cm in the center of the top of the copper ball, which is used for direct sunlight inspection at noon from summer to Sunday. Tropic of Cancer Monument in Taiwan Province Province June 5438+February 65438+May 2009, Tropic of Cancer Monument in Fengbin Township, Hualien County, Taiwan Province Province. There are three Tropic of Cancer landmarks in Taiwan Province Province, which span Penghu, Chiayi, Nantou and Hualien. One is located in Shuishang Township of Chiayi County in the west, and the other two are located in Mizuho Township and Fengbin Township of Hualien in the east. The Tropic of Cancer Monument in Fengbin Township, Hualien County is located on the east coast, near the Pacific Ocean. It is 27 kilometers away from the provincial platform 1 1 line and belongs to Fengbin Township, Hualien County. The monument was built on an open space next to the roundabout road, with a height of about 20 meters. It is a tower-shaped stone monument building. On the top of the monument, there is a sphere intersecting the north and south and a cylindrical sign, which only marks the Tropic of Cancer with a narrow gap in the middle. There are four characters of the Tropic of Cancer on the tablet, and the words "23 27' 4.55438+0" are engraved on the tablet. The Tropic of Cancer is the dividing line between the tropical zone and the warm zone, and the tropical zone is located to the south of it. Tourists often take photos here as a souvenir. Guangzhou Conghua Tropic of Cancer Logo Tower Guangzhou Conghua Tropic of Cancer Logo Tower is located on the hillside of Sanjiazi, Youmapu Village, Taiping Town, Conghua District, Guangzhou (23 26' 28 "44s,113 28' 56.438+06e), 42km away from Guangzhou. It is the highest and largest Tropic of Cancer in the world. The building at the bottom of the tower is in the style of the Temple of Heaven and consists of three steps. The first and second steps are square railings, and the third step is hemispherical, with a total of 9 steps, all of which are granite. The tower is like a space rocket waiting for ignition. There is a copper ball symbolizing the sun at the top of the tower, which is made of 26 pieces of 6 mm thick copper plates with a diameter of 120 cm. There are four flanks around the sign tower, showing the southeast, northeast, southwest and northwest directions respectively. The front of the tower is engraved with the seven characters "Tropic of Cancer Sign Tower". East, south, west and north 1 arch, visitors can enter. A copper core is embedded in the center of the tower bottom opposite to the top ball. The tower is hollow and the Tropic of Cancer is passing through here. Tourists stand in the copper core at the bottom of the tower and look up at the sky from a round hole and copper ball in the center of the tower. At noon 12: 26 every summer solstice, when the direct light of the sun passes through here, people can't see the shadow standing here. After the completion of the sign tower, 28 mu of land will be set aside from Taiping to build the Tropic of Cancer Park.