spherical trigonometry

noun

the branch of trigonometry concerned with the measurement of the angles and sides of spherical triangles

First recorded in 1720–30

He invented the sciences of plane and spherical trigonometry, and was the first to use right ascensions and declinations.

By this time I had studied plane and spherical trigonometry, conic sections, and Fergusson's "Astronomy."

It would be well to have such means at hand in teaching spherical trigonometry.

Musa, above mentioned, was the author of a "Treatise on Spherical Trigonometry."

As early as 1000 spherical trigonometry was in use, and Aboul-Hassan wrote an excellent treatise on conic sections.

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