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1. To find the Distance say,
As Sc of the Rumb,
To the X of Latitude.
So is Radius or S. 90°,
To the Distance required.
2. To find the Difference of Longitude say,
As Radius or S. 90°,
To the X. of Latitude in M. Parts.
So is T. of the Rumb,
To the X. of Longitude required.