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SIDEREAL TIME The measure of time as defined by the diurnal motion of the vernal equinox. A sidereal day is equivalent to one complete rotation of the earth relative to the equinox, which is 23 hours, 56 minutes, and 4.091 seconds.
local time"Time, as measured for a given point on the earth. Local sidereal time, for instance, is by Greenwich sidereal time minus the local longitude of the point (15° longitude is equivalent to a one-hour change in time).
 See also: Earth, Sidereal, Advection, Meteor, Low
  
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