Using a Mariner's Astrolabe

Using a mariner's astrolabe to measure the angle of the Sun or a star above the horizontal.

Caption:
Using a mariner's astrolabe to measure the angle of the Sun or a star above the horizontal.
Type: Illustration
Credit: Smithsonian Institution Libraries
Origin: Smithsonian Institution
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Using a mariner's astrolabe to measure the angle of the Sun or a star above the horizontal.