by Joan Blaeu


Date of first edition: 1662

Date of this edition: 1664

Dimensions (not including margins): 26,5 x 40 cm

Dimensions (including margins): 31,5 x 53

Condition: Mint. Sharp copper engraving printed on paper.

Condition rating: A+

Verso: text in Dutch

Map reference: Van der Krogt P-Brahe#13:2

From: Grooten Atlas, oft Werelt- Beschryving, in welcke ‘t Aerdryck, de Zee, en Hemel, wort vertoont en beschreven. Van der Krogt 2, 2621


Item number:
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Price (without VAT, possibly to be added): 650,00 (FYI +/- $721,50 / £578,50)
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The Quadrant

The quadrant would have already been described by Ptolemeus. It is a navigation tool in the form of a wooden or bronze quarter of a circle. There were multiple types of quadrants. They helped to calculate a celestial body position, to determine the time and to record the latitude. In the thirteenth century it was rewritten by John the Sacrobosco in Paris and Jacob ben Machir ibn Tibbon (also called Profatius) in Montpellier. The disadvantage of the quadrant is its instability in case of a moving ship, so the use of this instrument at sea was not so practical. The bigger the instrument, the more accurate its  calculations will be. The illustrated apparatus has been built by Brahe in 1588, and measured 194 cm

Original title: Quadrans Magnus Chalibeus in quadrato etiam comprehensus, unaque Azimuthalis