
In spherical coordinates, colatitude is the complementary angle of the latitude, i.e. the difference between 90° and the latitude, where southern latitudes are denoted with a minus sign. ==Examples== Latitude and colatitude sum up to 90°. ==Astronomical use== The colatitude is most useful in astronomy because it refers to the zenith distance of ...
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http://en.wikipedia.org/wiki/Colatitude

• (n.) The complement of the latitude, or the difference between any latitude and ninety degrees.
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http://thinkexist.com/dictionary/meaning/colatitude/
Co·lat'i·tude noun [ Formed like
cosine . See
Cosine .] The complement of the latitude, or the difference between any latitude and ninety degrees.
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http://www.encyclo.co.uk/webster/C/107

the complement of the latitude; the difference between a given latitude and 90°.
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https://www.infoplease.com/dictionary/colatitude
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