As the proper Distance upon the Rhumb is to the Radius;
So is the proper Difference of Latitudes to the Co-sine of the Rhumb from the Meridian:
To the extent possible under law, the Text Creation Partnership has waived all copyright and related or neighboring rights to this keyboarded and encoded edition of the work described above, according to the terms of the CC0 1.0 Public Domain Dedication ( http://creativecommons.org/publicdomain/zero/1.0/). This waiver does not extend to any page images or other supplementary files associated with this work, which may be protected by copyright or other license restrictions. Please go to http://www.textcreationpartnership.org/ for more information.
This text has been selected for inclusion in the EEBO-TCP: Navigations collection, funded by the National Endowment for the Humanities.
As the proper Distance upon the Rhumb is to the Radius;
So is the proper Difference of Latitudes to the Co-sine of the Rhumb from the Meridian:
And
So is the Sine of the Rhumb from the Meridian to the Diffe∣rence of Longitude.
Thus, if one of the Places be in the Latitude of 50 degr. and the other in 55 degr. and their proper Distance upon the Rhumb 6 degr. or 120 Leagues; their Difference of Longi∣tude will be found to be 5 degr. 30 min.