阅读Task 3 The Royal Observatory at Greenwich was founded in 1675 by King Charles II to "perfect the art of navigation at sea" by precise measurements of the positions of stars. The idea was that sailors could use accurate tables of stars to find their longitude at sea. The original red-brick building, now called Flamsteed House after John Flamsteed the first Astronomer Royal, was designed by Sir Christopher Wren, the architect of St. Paul's Cathedral. The Observatory is the point from which time and space are measured for the whole world. It is the home of the Prime Meridian(本初子午线), longitude 0o, the line running between the North and South Poles. Dividing the Eastern and Western hemispheres the line provides a fixed reference point from which to measure. In 1884, the International Meridian Conference in Washington D.C. recognized the Greenwich Meridian as longitude zero for the world. By the early 1950s the astronomers left Greenwich for Herstmonceux, Sus, away from the bad air and moving pollution of London. In the late 1960s the main telescopes were moved abroad, with operations shifting to the Royal Greenwich Observatory at Cambridge. In November 1998 the Greenwich site resumed the title "Royal Observatory Greenwich" establishing an exciting new role as the national centre for astronomy information and the public understanding of science. Both at Greenwich and through the internet a wide variety of educational programmes, media work and public demonstrations means modern astronomy continues to occupy a valuable place at the Royal Observatory. The Royal Observatory Founded: In the year of (46)____.