Right sphere

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(Astron. & Geol.) a sphere in such a position that the equator cuts the horizon at right angles; in spherical projections, that position of the sphere in which the primitive plane coincides with the plane of the equator.
- Ham. Nav. Encyc.

See also: Right

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The left sphere is three times the size of the right sphere. This difference creates a hierarchy between the two objects.