Bart Oosterhoff

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Bart Oosterhoff
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Astrolab (dated 9th century): This was for measuring the altitude of heavenly bodies above the horizon, and so determining (among other things) the time of day or night. Readings are taken by means of rotatable alidade, a diametrical rule with sights.

Astrolab (dated century): This was for measuring the altitude of heavenly bodies above the horizon, and so determining (among other things) the time of day or night. Readings are taken by means of rotatable alidade, a diametrical rule with sights.

Victorian Astrolabe. A very ancient astronomical computer for solving problems relating to time and the position of the Sun and stars in the sky.

This is an astronomical compendium including a quadrant, room for drawing instruments, a compass, a universal equinoctial sundial, a table of latitudes of towns and an incomplete calendar.

Astrolabe, magnificent computer of the Ancients—an instrument used to make astronomical measurements, before the development of the sextant

Vintage & Astrolabe – Ancient instrument for locating and predicting the positions of the Sun, Moon, planets, and stars. The earliest astrolabe was created 150 B. Was an indispensable tool of astronomers, navigators and astrologers. on imgfave

Astrolabe of 'Umar ibn Yusuf ibn 'Umar ibn 'Ali ibn Rasul al–Muzaffari, Rasulid period (1228–1454), dated A.H. 690 / A.D. 1291 Yemen.  Brass; cast and hammered, pierced, chased, inlaid with silver; case.  The Metropolitan Museum.

Astrolabe of 'Umar ibn Yusuf ibn 'Umar ibn 'Ali ibn Rasul al–Muzaffari, Rasulid period dated A. cast and hammered, pierced, chased, inlaid with silver; The Metropolitan Museum.