A comb-bound textbook/workbook praised by The Practical Sailor as "a first-class piece of work", Susan Howell's Practical Celestial Navigation was developed for Mystic Seaport's navigation courses. This third edition, published by the Seaport's Planetarium, retains the step-by-step format of the original, along with an abundance of diagrams and practice problems. Practical Celestial Navigation is recommended as a self-instruction text for beginners or for old celestial hands getting back in practice.