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"Originally used for any instrument used for observing stars; afterwards used for an instrument for measurement of altitute; replaced, in modern times, by the quadrant." — Williams, 1889

Astrolabe

"Originally used for any instrument used for observing stars; afterwards used for an instrument for…

A historical astronomical instrument used to predict positions of the Sun, Moon, planets and stars.

Later Astrolabe

A historical astronomical instrument used to predict positions of the Sun, Moon, planets and stars.

A historical astronomical instrument used to predict positions of the Sun, Moon, planets and stars.

Regiomontanus' Astrolabe

A historical astronomical instrument used to predict positions of the Sun, Moon, planets and stars.