Printed in Seville in the XVI century, it is the work of the Aragonese cosmographer and navigator Martín Cortés, resident in Cádiz for most of his life, where he was a teacher.
This is a most particular interesting piece in Spanish scientific history and for this reason a copy was included in the exposition "Science through the ages", which took place in the Oxford Bodleian Library some years ago.
This work states the variability of magnetic declination of the compass in different places on the globe, as opposed to the generalized opinion stated in other works of the time.
Due to the recognition of its worth and interest in the XVI century comes the translation into English, which was carried out by Richard Eden which during the XVI century had six London editions.
We have 1 facsimile edition of the manuscript "Breve Compendio de la Sphera y de la Arte de Navegar": Breve Compendio de la Sphera y de la Arte de Navegar: con nuevos instrumentos y reglas, exemplificado con muy subtiles demonstraciones facsimile edition, published by Vicent Garcia Editores, 1996
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