What's the use of artificial earth satellites? What's the name of China's first artificial satellite?

Dongfanghong-1, the first artificial earth satellite designed and manufactured by China, was successfully launched by the Long March-1 carrier rocket. And play the music of Dongfanghong.

Satellites have many uses, which can be divided into the following types according to different uses: 1. Scientific satellites: Scientific satellites are satellites used for scientific exploration and research, mainly including space physics exploration satellites and astronomical satellites, which are used to study the upper atmosphere, the earth's radiation belt, the earth's magnetosphere, cosmic rays and solar radiation. And can observe other stars.

2. Technical test satellites: Technical test satellites are satellites used to test new technologies or application satellites. There are many new principles, materials and instruments in space technology. Whether it can be used or not must pass the test of heaven.

3. Applied satellites: The satellites closest to our lives are those that directly serve mankind. It has the largest variety and quantity, including: communication satellites, meteorological satellites, navigation satellites, geodesic satellites, earth resources satellites and so on.

Communication satellite: it can be used to transmit telephone, telegraph, TV, newspaper, fax, voice broadcast, time scale, data, video conference, etc.

Meteorological satellite: used to photograph clouds and measure temperature and rainfall. According to the types of meteorological satellites, there are both geostationary orbit and near-earth orbit. Meteorological satellites are used to help make more accurate weather forecasts.

Navigation satellite: the technology of navigation and positioning for users on the ground, ocean, air and space. Common GPS navigation and Beidou navigation are all satellite navigation.

Geodetic satellite: The principle of satellite geodesy is similar to that of satellite navigation. Geodetic satellites can complete geodesy, topographic survey, map mapping, earth shape measurement, and gravity and artificial earth satellite geomagnetic field measurement.

Resource satellite: a satellite used to investigate and study the earth's natural resources. It can "see through" the stratum, find underground treasures, historical sites and stratum structure that people can't see with the naked eye, survey crops, forests, oceans, air and other resources, and predict various serious natural disasters.