Table 1.
Some Variable Definitions
| Semimajor axis, mean motion, and eccentricity of moon | a, n, e |
|---|---|
| Earth mass and radius | M, R |
| Lunar mass and radius | m, Rm |
| Mass ratio m/M | μ |
| Earth spin rate, lunar spin rate | s, sm |
| Angular momentum of Earth-Moon system | LEM |
| Angular momentum of lunar orbit | Lorb |
| Measure of the strength ratio of lunar to Earth tides | A |
| Maximum principal moments of inertia of Earth, Moon | C, Cm |
| Ratio of principal moments Cm/C | κ |
| Gyration constant for Earth | λ |
| Ratio of μ/λ | γ |
| Circumterrestrial orbital frequency at R | Ω⊕ |
| Earth’s orbital frequency about the Sun | Ω⊙ |
| Tidal lag times, lag angle, and Love numbers for Earth, Moon | Δt, Δtm, δ, kT, km |
| Tidal evolution time constant | tT |
| Normalized tidal evolution time | χ = Ω⊙tT |
| Libration amplitude | Θ |