oblique equator

oblique equator

[ə′blēk i′kwād·ər]
(mapping)
A great circle, the plane of which is perpendicular to the axis of an oblique projection; an oblique equator serves as the origin for measurement of oblique latitude; on an oblique Mercator projection, the oblique equator is the tangent great circle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Accordingly, displacements near the ground track from nearby points might be well-approximated by displacements near the equator of an oblique conic projection (where the oblique equator is locally tangent to the ground track).
The space oblique conic projection

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