Day side
Night side
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Earth's rotation at 15° per hour is the real physical basis of every civil timezone. This simulator spins a textured 3D globe at that true angular rate under a fixed sun light, so the day/night terminator is a genuine lighting result rather than a drawn overlay, while 24 idealized 15°-wide bands rotate with the surface and update their local clocks live — click anywhere to read a location's real local time relative to a chosen reference zone.