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Reference.org
Reflecting instrument
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<p>Reflecting instruments are those that use <a href="/facts/Mirror/wMu4u6BB">mirrors</a> to enhance their ability to make measurements. In particular, the use of mirrors permits one to observe two objects simultaneously while measuring the <a href="/facts/Angular_distance/6ob2n0Wb">angular distance</a> between the objects. While reflecting instruments are used in many professions, they are primarily associated with <a href="/facts/Celestial_navigation/pCpbhzJt">celestial navigation</a> as the need to solve navigation problems, in particular the <a href="/facts/Board_of_Longitude/kX7puPT6">problem of the longitude</a>, was the primary motivation in their development. </p>