Parker's projection of the longitude at sea: whereby the mariners may be enabled to correct their accounts thereof, as often as they shall have the benefit of a clear sky and calm sea, at the time of the moon's visible southing. ... By Benjamin Parker.
Parker, Benjamin,-1747.
Nottingham : printed by A. Ayscough for S. Hodgkinson, Derby, and sold by the booksellers of London and Westminster and at most seaport towns in England: also by Jer Roe, Derby,
1731.
ESTC