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Vinony

Tables for azimuths, great-circle sailing, and reduction to the meridian, with a new and improved "Sumner" method: latitudes 90⁰ N. to 90⁰ S., declinations 90⁰ N. to 90⁰ S

by Harold S. Blackburne

Cover of Tables for azimuths, great-circle sailing, and reduction to the meridian, with a new and improved "Sumner" method: latitudes 90⁰ N. to 90⁰ S., declinations 90⁰ N. to 90⁰ S

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TablesSumner's methodNavigationGreat-circle sailing