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I like it and am interested to see how this evolves. I would love it to replace the simple clock on my iPhone screen.

For my own purposes I would like to see accurate day/night line that moves with the map.

Me too! Issue is that different longitudes have different sunrise/sunset times, so I went with an arbitrary cut down the middle to get a rough idea of how people in other timezones are feeling right now (tired, close to dark, etc)

Sunrise/sunset times do vary with longitude (depending on how close you are to the centre of the timezone you 'should' be in, and also summer time), but the biggest variation is with latitude. Especially near the solstices like now.

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