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Loading contentThe mathematical foundation of motion and time — the orbital-mechanics concepts (Kepler's laws, Lagrange points, resonances, tidal evolution), the reference frames and epochs (ICRS, J2000), and the ephemeris systems (JPL DE, SPICE, Horizons).
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| Name | Type | ID |
|---|---|---|
| JPL Development Ephemeris | Ephemeris system | ephemeris_system:jpl-development-ephemeris |
| JPL Horizons | Ephemeris system | ephemeris_system:jpl-horizons |
| Lagrange Points | Orbital mechanics concept | orbital_mechanics_concept:lagrange-points |
| Mean-Motion Resonance | Orbital mechanics concept | orbital_mechanics_concept:mean-motion-resonance |
| N-Body Dynamics | Orbital mechanics concept | orbital_mechanics_concept:n-body-dynamics |
| Orbital Elements | Orbital mechanics concept | orbital_mechanics_concept:orbital-elements |
| Orbital Perturbations | Orbital mechanics concept | orbital_mechanics_concept:orbital-perturbations |
| Secular Resonance | Orbital mechanics concept | orbital_mechanics_concept:secular-resonance |
| Spin–Orbit Coupling | Orbital mechanics concept | orbital_mechanics_concept:spin-orbit-coupling |
| The B1950 Epoch | Reference frame | reference_frame:b1950 |
| The Barycentric Celestial Reference System | Reference frame | reference_frame:bcrs |
| The Ecliptic & Equinox | Reference frame | reference_frame:the-ecliptic |
| The Fifth Fundamental Catalogue (FK5) | Reference frame | reference_frame:fk5 |
| The Fourth Fundamental Catalogue (FK4) | Reference frame | reference_frame:fk4 |
| The Geocentric Celestial Reference System | Reference frame | reference_frame:gcrs |
| The Hill Sphere | Orbital mechanics concept | orbital_mechanics_concept:hill-sphere |
| The International Celestial Reference Frame (ICRF3) | Reference frame | reference_frame:icrf3 |
| The International Celestial Reference System | Reference frame | reference_frame:icrs |
| The J2000 Epoch | Reference frame | reference_frame:j2000 |
| The Restricted Three-Body Problem | Orbital mechanics concept | orbital_mechanics_concept:restricted-three-body-problem |
| The Roche Limit | Orbital mechanics concept | orbital_mechanics_concept:roche-limit |
| The SPICE Toolkit | Ephemeris system | ephemeris_system:spice-toolkit |
| Tidal Evolution | Orbital mechanics concept | orbital_mechanics_concept:tidal-evolution |
Facts on this topic will be cited from these primary and reference sources.