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    Re: Captains Logbook from 1687 describes longitude
    From: David C
    Date: 2016 Nov 28, 20:06 -0800

    I googled Paris Meridian. A wikipedia article mentions the ferro meridian which is 20° west of Paris.  Is the ferro meridian where the longitude in the log  changes from  a number near zero to one near 360?

       
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