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We have become accustomed to the way of numbers and
pointers to show the time. However, initially, people on a day of
cognition is through the day and night to identify. "Earth time"，by simulating
the solar light, makes different area of the earth surface turn to be dark, to display the time.
This is a more similar way to nature to display time, so that you can know the
approximate time of all over the world, if want to know a specific time
of some place, only need to use your fingers touch on the surface,
it can show the specific time on it's surface.
Dalian Minzu University