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Spherical trigonometry
Spherical trigonometry
is the branch of
spherical geometry
that deals with the relationships between
trigonometric functions
of the
sides
and
angles
of the spherical polygons (especially spherical triangles) defined by a number of intersecting
great circles
on the
sphere
. Spherical trigonometry is of great importance for calculations in
astronomy
,
geodesy
and
navigation
.
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