This manual has grown out of all the courses given by Dominique Prinet a certified InstructorEvaluator for Sail Canada who has been teaching celestial navigation since 2000. It has benefitted from the thoughtful contributions of over 100 students. The aim of Celestial Navigation is to give a sufficient grounding in the subject to determine position at sea using a sextant for fixes on the sun moon stars and planets. Furthermore the material presented will prepare a reader who wishes to pursue a Celestial Navigation Certificate through selfstudy.The subject requires some comfort with the basic concepts of navigation but the prospective navigator only needs to know how to add and subtract either times or angles. Lucid and wellpaced Celestial Navigation starts with fundamentals and definitions which ensure that a motivated student need not bring anything more to the table than his or her willingness to master the subject. Richly illustrated it includes a chapter with more than forty pages of review exercises covering all topics. The cleverness of many of the concepts explained here will bring about great intellectual joy and satisfaction. Whether you are a recreational sailor or an individual pursuing professional certification as a navigator Celestial Navigation will teach you what you need to know.