**Apogee** - Planet has fastest spin, slowest orbit, least mass, least attraction.
**Perigee** - Planet has slowest spin, fastest orbit, most mass, most attraction.

From Apogee to Perigee - Planet is slowing spin, increasing orbit velocity, increasing mass, increasing attraction.

From Perigee to Apogee - Planet is increasing spin, decreasing orbit velocity, decreasing mass, decreasing attraction.

This simple illustration of periodically contracting and expanding orbits demonstrates a fundamental attribute of all vibrating or oscillating bodies: expansion and contraction. These two seemingly opposing conditions are governed by more fundamental forces whose mathematical description must include numerous interlocked variables. See Part 12 - Russells Locked Potentials

**Figure 9.10 - Phases of a Wave as series of Expansions and Contractions as per Square Law and Inverse Square Law.**

See Also

**9.23 - Circular Harmonic Orbit**
**9.24 - Elliptical Enharmonic Orbit**
**12.38 - Orbital revolution**
**Attraction**
**Figure 9.11 - Compression Wave with expanded and contracted Orbits**
**Gravitation**
**Gravity**
**Repulsion**