Once people began to travel quickly over large distances (by train for example), getting the right time at the destination, and all places on the way, became very important.
Imagine trying to set up a train timetable when all places on the route have slightly different times!
This is a picture of Sir Sandford Fleming who, in 1878, came up with a great idea for organizing time in different places. He suggesting that the world should be divided into 24 time zones, one for each hour in a day. All places within each zone would use exactly the same time