Celestial navigation; : a quick, easy, and thorough explanation, with realistically worked examples, of the practice of celestial navigation at sea, using simple and inexpensive equipment and requiring only the ability to add and subtract figures,
Celestial navigation; : a quick, easy, and thorough explanation, with realistically worked examples, of the practice of celestial navigation at sea, using simple and inexpensive equipment and requiring only the ability to add and subtract figures,