Time changes by one hour for each 15° degree change in longitude; this is because
A) it was determined by how fast 17th century ships could travel.
B) 15° insures that major population centers have unique time zones.
C) early navigation instruments did not allow better accuracy than 15 degrees.
D) 15° was chosen arbitrarily.
E) twenty-four latitude lines were chosen so that 24 hours represents a 360° revolution around
the planet.
Answer: E
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