学生作品库 学生作品库 Royal Observatory Greenwich.ppt

Present by group 6 The world famous Royal Observatory Greenwich is built in 1675 in Greenwich Park, east of London.In 1997, it was listed as a world heritage site.The Royal Observatory Greenwich is one of the most famous attractions in London. The old Greenwich observatory site has become an astronomy station for the British navigation department and the national Marine museum.It is also a popular tourist attraction and astronomy education base. At the beginning of the Greenwich observatory built, is aimed at a precise observation, the moon and the stars, solve the problem of determination of longitude on the sea, think of the rapid development of the maritime cause to offer help. This clock is called Shepherd Gate Clock, and the special thing is that it turns clockwise 24 hours. This clock made in 1851 by Charles Shepherd, its a slave clock, through a wire with inside the main building to provide the main clock phase of GST, that means the table clock time adjust acceptor clock control. This is the starting point for the international scientific community to determine the geographic longitude and the world of the world.A more than 10 cm wide, 10 meters long copper wire embedded in marble, straight from the meridian house, this is the world famous Prime Meridian, also called Zero Meridian. From May 1, 1993, each night observatory will have a laser beam showing the position of the prime meridian. In December 1999, the newer laser launchers started firing the green light. When the weather is fine, you can still see the laser with the naked eye, 57 kilometers away, using a telescope, which is more than 95 kilometers away.