astronomical triangle

astronomical triangle

noun
the spherical triangle formed by the great circles connecting a celestial object, the zenith, and the celestial pole.

Origin:
1915–20

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Astronomical triangle is always a great word to know.
So is quincunx. Does it mean:
a fool or simpleton; ninny.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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