[NAVIGATION]. BLONDEL-SAINT-AUBIN (Guillaume). The Principles of Navigation. Covering the use of the golden ratio, epacts, tides, the angular separation of the Moon from the Sun, and the solar circle. In addition, an abridgment of the sphere […]. In Havre de Grace, published by Jacques Gruchet, 1675 [“Printed on March 12, 1676.”] Small 12mo (85 x 136 mm), bronze morocco, gilt fillet framing the covers, decorated ribbed spine, red morocco lining adorned with crossed anchors, gilt edges (contemporary binding). 94 + [I] pp. FIRST EDITION of one of the very first books printed in Le Havre, which appears to be missing from the B. N. F. Two woodcut vignettes, one at the beginning of the volume featuring the coat of arms of François de BEAUVILLIER, Duke of SAINT-AIGNAN & Peer of France (d. 1687), GOVERNOR OF LE HAVRE in 1664, to whom the work is dedicated, and the second at the end of the volume; one sketch in the text. Spine worn, with minor soiling and handwritten inscriptions on the front endpaper, but A BEAUTIFUL COPY IN CONTEMPORARY MOROCCAN LEATHER BINDING.