1. AMS ellipsoids are typically oblate with gently plunging long axes (lineations).

2. Maps and projections: principles of cartography, ellipsoids, cartographic projections, coordinate systems, types and scales; accuracy of maps

3. Reference ellipsoids are also useful for geodetic mapping of other planetary bodies including planets, their satellites, asteroids and comet nuclei.

4. Blobby models are built from simple primitive shapes (ellipsoids and sausage-like cylinders with rounded ends in the current implementation

5. One is an Aplanat with spherical primary and secondary, and the other is anastigmatic Aplanat with two moderately strong prolate ellipsoids (including primary) and a sphere (FIG.128)