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    jessica90025la's Avatar
    jessica90025la Posts: 1, Reputation: 1
    New Member

    Mar 3, 2008, 05:58 PM
    Oceanography:I need the formula to find the time difference for longitude
    Help! I need to find out how to calculate the time difference... of:
    118 degrees 15'W and
    81 degrees 47'W

    Please explain, I know you divide by 15 but?? :eek:
    ebaines's Avatar
    ebaines Posts: 12,132, Reputation: 1307

    Mar 4, 2008, 06:37 AM
    Are you trying to determine the difference in sunrise (or sunset) between the two longitudres? The earth rotates at 15 degrees per hour (that's because it turns a full 360 degrees in 24 hours), or 900 minutes/hour. Find the difference in longitude between the 2 points, and divide by 15 degrees/hour or 900 minutes/hour as needed.

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