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Reference.org
Octant (instrument)
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<p>The octant, also called a reflecting <a href="/facts/Quadrant_(instrument)/NE598Atq">quadrant</a>, is a <a href="/facts/Reflecting_instrument/vQhSM0xB">reflecting instrument</a> used in <a href="/facts/Navigation/sGGAJ0AQ">navigation</a>. </p>