Egbertus Havinga (1872 - 1938) was a former first officer and captain of the N.V. Rotterdamsche Lloyd, a well-known Dutch shipping company.
In 1902 he wrote this fascinating book about navigating the sea using the stars, which received a second edition in 1916. That second edition was a thorough reworking and expansion of the first edition.
Two beautiful maps accompanied the book - the Dutch astronomer Dr. Jan van der Bilt named these maps 'the best ever made available in The Netherlands' (Hemel & Dampkring 1938, page 148).
The maps shown here are from the first edition. The book is rare and as a consequense almost completely forgotten, the maps themselves are extremely rare.
Havinga was an avid observer of the 'green flash' and was one of the initiators and co-author of the famous book about the Eise Eisinga planetarium in Franeker, published in 1928.