Phil Somerville, a hugely experienced instructor in celestial navigation, breaks down what you need to do to successfully fix your position using the biggest celestial object in the sky - the sun - explaining why at every point. Clear colour diagrams, time-tested checklist sheets (proformas) and an informal teaching style ensure this book is understandable, interesting and memorable. There is also a troubleshooting section at the end covering common pitfalls (compiled from years of teaching students) and Quick Start refresher guides throughout, ensuring that what you have learned is a repeatable process months, or even years, later. Online materials supplement the text and exercises in the book, for additional practice. Who needs this book? Sailors seeking navigational independence. Those wanting to demystify this age-old maritime skill and put it into practice. Anyone interested in qualifying as a commercial skipper or captain with institutions such as the RYA, MCA or other flag state maritime organisations. Commercial mariners and sailors who may have learned these skills in the past but require an onboard back-up resource for practice or in readiness for a time of real need. Book jacket.