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How a Bubble Sextant Measures Altitude Without a Sea Horizon

Bob the Science Guy Short 11 days ago

Description

A bubble sextant establishes a local vertical reference and constructs the horizontal. Bob explains how it measures a celestial object’s angular altitude without a visible sea horizon.

Want to learn more? Watch this related public BtSG video:
Can You Find Your Position Without A Sea Horizon?
https://www.youtube.com/watch?v=UsekW824wJA

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