# spherical angle

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## spherical angle

See spherical triangle.

## spherical angle

[¦sfir·ə·kəl ′aŋ·gəl]
(mathematics)
The figure formed by the intersection of two great circles on a sphere, and equal in size to the angle formed by the tangents to the great circles at the point of intersection.
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As shown in Figure 1, the received signal fequency depends on the transmitted frequency, the speed of the receiver, and the true spherical angle between the transmitter and the velocity vector of the receiver.
(62) This is a variation on an example of Yaffe's in which the angles are all spherical angles (rather than flat angles as here) hut there is deviation from a spherical triangle somewhere between the vertices.
The typical approach to calculation of the offset angle is to first calculate the azimuth and elevation components of the threat angle of arrival at the aircraft's location -- then to set up a spherical triangle to calculate the spherical angle between each individual antenna and the vector toward the emitter.

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