Professor Waning Glory takes his new friend Tubby on a trip in a boat that stays always at
9 p.m. in a lofty time-river of some sort, starting at Coney Island, then Chicago, then
Denver, and farther west. The professor is able to briefly stop the boat above Chicago, where
time for those below stays frozen at 9 p.m., and when their boat crosses the 180°
meridian, they travel back a day. Eventually, they arrive back at their starting point on
Coney Island, where it is still 9 p.m.
— Michael Main
Time is what keeps everything from happening at once.
1 English variant