bubble sextant
noun
: a sextant used especially in aerial navigation in which the image of the heavenly body being observed is brought to the edge of a bubble instead of to the sea horizon, the bubble appearing in its proper position in the field of view only when the sextant is held so that its zero plane is the observer's horizontal plane
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“Bubble sextant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bubble%20sextant. Accessed 25 Nov. 2024.
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