hour is longer in summer and shorter in winter, right? so hours are flexible. in europe, people started putting clocks on bell towers, so there was a common time plot measured for the village. but the next village would have a different time, because the 12:00 was set when the sun is at the utmost position. and of course the sun doesn't get me to the same utmost position in different places. when you move west, the sun comes up later. >> and every village would have a different time. >> its own time, right? >> now you say that's the correct understanding. >> that's the correct understanding of time. people got together somehow and said -- and it was mostly because of trains, because it's hard to set a train timetable if every town has its own different time. in the late 19th century, the