The meridian transit telescope, working with a chronograph and accurate astronomical clocks, is capable of making extremely precise measurements of star positions. The right ascension of a star can be ...

The planetarium, the oldest in Japan, stands on the meridian of 135 degrees east longitude, which establishes Japan Standard Time. The clock is mounted near the top of the 54-meter-tall tower and ...

There are 24 time zones. There is an imaginary line running through the UK called the Prime Meridian. It runs through a place in London called Greenwich. The Prime Meridian splits the world into ...