Astrolabe

[As·tro*labe]

An astrolabe is an ancient instrument used for estimating the altitude and predicting the position of celestial objects, such as the moon, other planets, and stars.

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An instrument for observing or showing the positions of the stars. It is now disused.

Noun
an early form of sextant

n.
An instrument for observing or showing the positions of the stars. It is now disused.

n.
A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere.

Astrolabe

As"tro*labe , n. [OE. astrolabie, astrilabe, OF. astrelabe, F. astrolabe, LL. astrolabium, fr. Gr. ; star + , , to take.] 1. (Astron.) An instrument for observing or showing the positions of the stars. It is now disused. &hand; Among the ancients, it was essentially the armillary sphere. A graduated circle with sights, for taking altitudes at sea, was called an astrolabe in the 18th century. It is now superseded by the quadrant and sextant. 2. A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere. Whewell.

An instrument for observing or showing the positions of the stars. It is now disused.

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Usage Examples

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