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Sun markerSubsolar point — where the Sun is directly overhead right now.
Shaded areaNight side of Earth. The Sun is below the horizon there.
Cyan lineTerminator — the moving twilight edge between day and night.
Gold dotA listed city currently in daylight.
Blue dotA listed city currently in night.
Positions are computed live from the device clock (UTC). City clocks use the
built-in time-zone database, so daylight saving is handled automatically.
Sunrise / sunset are accurate to about a minute.