It takes 2 hours 15 minutes by Eurostar from London to Paris via Euro tunnel, but there is one hour time difference between two countries. The reason is that many countries on the Continent such as France and Germany adopt UTC+1 as time zone. Even Spain located to the west of UK adopts the same time zone as France. According to the history of the Prime Meridian, the International Geographical Union decided Paris as the Prime Meridian in 1875, but UK made an objection against its decision, and the International Meridian Conference in 1884 selected Greenwich laboratory as the Prime Meridian. We wonder if the history of the Prime Meridian between the two countries has led to the adoption of different time zones.