Astrolabe, Michiel Coignet, Antwerp, 1601
Inv V03105

The astrolabe is a versatile instrument that was used as a chronometer and for astronomical and astrological calculations from antiquity down to the seventeenth century. In the Islamic world indeed the instrument remained in vogue far into the nineteenth century. At any moment of the day or night the user could measure the correct time with it; accurate to within a few minutes. But the reverse was also possible: determining the positions of the celestial bodies in relation to the horizon. Practical surveying problems such as determining the height of a tower or the breadth of a waterway could be solved with it. Moslems also used the astrolabes to determine their times of prayer and for finding the direction of Mecca. Michiel Coignet was a celebrated Antwerp instrument-maker and mathematician. He advised Archduke Albrecht of Austria who was fighting the revolt of the Netherlands on behalf of the Spanish king.