The Historic Settlement of Greenwich

Tourist Attractions

Home of the Royal Observatory, Greenwich is a famous tourist destination because Greenwich Mean Time (GMT) is a term originally referring to mean solar time at the Royal Observatory in Greenwich.

Greenwich Park Vista

As the United Kingdom grew into an advanced maritime nation, British mariners kept at least one chronometer on GMT in order to calculate their longitude from the Greenwich meridian, which was by convention considered to have longitude zero degrees. Most time zones were based upon this reference as a number of hours and half-hours "ahead of GMT" or "behind GMT".

Source: Wikipedia

Here is a list of more pages about the United Kingdom: