The seamans new kalendar, of the sun, moon, and fixed stars : Being a necessary tutor. Furnish'd with such precepts in arthmetick, geometry, trigonometry, geography, &c. As are requisite for a seaman to know. With the desciption and use of such instruments and tables as are useful at sea, both for observation and operation. Also an introduction to the art of navigation exemplified in three kinds of recti-lineal sailing viz. plain, mercator, middle latitude. By William Leybourn, Philomath.