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

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Here, Denis' interpretation of North America's western coast includes an imaginary body of water (le Mer ou Baye de l'Ouest) located in the upper right sphere. Although many 18th century maps represented Baja California as an island, Denis' map at least depicts it correctly as a peninsula.
The left sphere is three times the size of the right sphere. This difference creates a hierarchy between the two objects.