From the Reference Files at the Plymouth District Library What are the different Time Zones in the United States?
There are four standard time zones in the continental United States. They are: • Eastern Standard Time centered on meridian 75 degrees • Central Standard Time centered on meridian 90 degrees • Mountain Standard Time centered on meridian 105 degrees • Pacific Standard Time centered on meridian 120 degrees. They are respectively 5,6,7,8 hours behind universal time (Greenwich.) Alaska Standard Time is at meridian 135 degrees and is 9 hours behind. Hawaii-Aleutian Standard Time is determined by the meridian at 150 degrees and is 10 hours behind. SOURCE: The New York Public Library Desk Reference Ref. 031 N p.
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