The main display of HourWorld shows seven clocks, each of which may be set to a location you choose. The shading of each clock indicates whether it is day, twilight or night at the clock's location. In this screen shot, the sun is near Hawaii, and the moon is over the Caribbean Sea. The daylight blends into twilight and then into darkness in with geometric accuracy calculated quickly by the PowerPC processor in the Power Macintosh.

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