Clocks
Three clocks we built for a screen on the wall at home. Each one fills the browser window and runs on its own: no account, no tracking, nothing loaded from anywhere else. The time comes from your device.
Open one on a tablet or an old laptop and leave it running. A tap
or click anywhere on a clock brings you back to this page. Add
?style=eink to any address for a black and white
version made for e-ink screens.
The clocks
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World clock
A map of the world with the night side shaded, moving as the day goes on. Six cities from west to east, each with an analog clock that is light by day and dark by night, the hours from Mountain Time, and sunrise and sunset.
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Swiss railway clock
The station clock designed by Hans Hilfiker in 1944. The red second hand sweeps the minute in 58.5 seconds, waits at the top, and sets off again when the minute hand steps. Add
?bg=lightfor a light surround or?tz=Europe/Zurichfor another time zone. -
Flat earth time map
The same six clocks on the old polar map: the North Pole in the middle, Antarctica as a ring of ice around the edge. The sun circles the disc once a day over the point where it is straight overhead, the moon follows its own path, and the dark side moves with them.
How they work
The coastlines come from Natural Earth, a public domain map set, and are drawn once into the page. The position of the sun is worked out from the date and time with a standard formula, so the day and night line is right to within a few minutes. The moon on the flat map uses a shorter formula and is good to about a degree. None of it needs the network after the page has loaded.