shorter in winter, right? so hours are flexible. and then 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 to the same utmosts position in different places. when you move toward the west, the sun comes later. >> and this would have been thought to be accurate? >> absolutely. >> every village would have a different time. >> has its own time, right. >> you say that's actually 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 village has its own different time. there was this agreement, late 19th century, the americans