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TIME ZONES AND UNIVERSAL TIME
Time (1)in a number of ways. For instance, we
(2) the passage of time via the orbital motion of the
Earth and other planets in the solar system (Dynamical Time). The
measure (3) on the rotation of the Earth on its axis with
respect to the stars, as well (Universal Time).
(Adapted from http: //eclipse.gsfc.nasa.gov/SEhelp/TimeZone.html)