Bogentag
A solar dial for your wrist.
iPhone · iPad · Apple Watch
Coming soon
Bogentag shows Bogenzeit — time read as a position on the Sun's arc, in spans from solar noon and midnight with kiloseconds beside them. The watch screen is the dial: a sky with its horizon and twilight bands, the Sun on its track, and the reading in the centre.
The dial, on your wrist
Apple Watch takes no third-party faces, so the app's screen is the face. A tap shows the civil clock.
On an Apple face too
Complications put the reading on the watch faces you already use.
Larger, on iPhone
The iPhone shows the same dial bigger, with a short tour of how the reading works.
Built on Bogenzeit
Bogenzeit is the open standard behind it, with a reference engine and the test vectors every port passes.