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plun9
There used to be a Palm OS app called CityTime that combined world clocks and twilight/night areas on a 2D map: https://palmdb.net/app/citytime

This is a webpage that has a clean map visualization: https://www.timeanddate.com/worldclock/sunearth.html

Here is another: https://in-the-sky.org//twilightmap.php

rajkverma123
the day light calculation is running under the hood need to integrate it. the connection with palm OS app is interesting