PRIME TIME
Jan. 1, 2000, doesn't officially begin at Greenwich, but don't tell that to anyone in Britain. The London borough, home to the Royal Observatory and located right smack on the 0[degree] meridian, will mark the stroke of midnight, Greenwich mean time, by shooting a green laser beam into the sky and bouncing a satellite signal around the world that will set off international celebrations.
After that, it's time to get down and party! Along the riverbanks upstream from Greenwich to central London about six miles to the west, festivals and street parties will run well past dawn, with cruisers...