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{"children": [{"name": "Astrophysical processes", "children": [{"name": "Astrophysical magnetism", "children": [{"name": "Cosmic magnetic fields theory"}, {"name": "Emerging flux tubes"}, {"name": "Magnetic fields", "children": [{"name": "Geomagnetic fields"}, {"name": "Magnetic anomalies"}, {"name": "Primordial magnetic fields"}]}]}, {"name": "Gravitation", "children": [{"name": "Celestial mechanics", "children": [{"name": "Apparent superluminal motion"}, {"name": "Astrodynamics"}, {"name": "Close encounters", "children": [{"name": "Opik theory"}]}, {"name": "Lunar theory", "children": [{"name": "Annual equation"}, {"name": "Anomalistic month"}, {"name": "Lunar node regression"}]}, {"name": "N-body problem", "children": [{"name": "Few-body systems"}]}, {"name": "Orbits", "children": [{"name": "Orbit determination"}, {"name": "Orbital elements", "children": [{"name": "Apsis", "children": [{"name": "Apastron"}, {"name": "Aphelion"}, {"name": "Apocenter"}, {"name": "Apogee"}, {"name": "Periapsis"}, {"name": "Periastron"}, {"name": "Perigee"}, {"name": "Perihelion"}]}, {"name": "Argument of perigee"}, {"name": "Argument of perihelion"}, {"name": "Center of mass"}, {"name": "Eccentricity"}, {"name": "Elliptical orbit", "children": [{"name": "Major axis"}, {"name": "Minor axis"}, {"name": "Semimajor axis"}, {"name": "Semiminor axis"}]}, {"name": "Inclination"}, {"name": "Longitude of the ascending node"}, {"name": "Longitude of the descending node"}, {"name": "Orbital anomalies", "children": [{"name": "Eccentric anomaly"}, {"name": "Mean anomaly"}, {"name": "True anomaly"}]}, {"name": "Osculatory elements"}, {"name": "Position angle"}, {"name": "Synodic period"}]}, {"name": "Orbital motion", "children": [{"name": "Apsidal motion"}, {"name": "Circular orbit"}, {"name": "Elliptical orbit", "children": [{"name": "Major axis"}, {"name": "Minor axis"}, {"name": "Semimajor axis"}, {"name": "Semiminor axis"}]}, {"name": "Equation of the center"}, {"name": "Geocentric orbit"}, {"name": "Heliocentric orbit"}, {"name": "Hyperbolic orbit"}, {"name": "Keplerian orbit"}, {"name": "Libration"}, {"name": "Lunar node regression"}, {"name": "Osculating orbit"}, {"name": "Parabolic orbit"}, {"name": "Periodic orbit"}, {"name": "Polar orbit"}]}, {"name": "Orbital nodes", "children": [{"name": "Ascending node"}, {"name": "Descending node"}]}, {"name": "Orbital resonances", "children": [{"name": "Kirkwood gap"}]}, {"name": "Orbital theory", "children": [{"name": "Bode's law"}]}]}, {"name": "Perturbation methods"}, {"name": "Three-body problem", "children": [{"name": "Lagrangian points"}, {"name": "Mass ratio"}, {"name": "Roche limit"}, {"name": "Roche lobe"}]}, {"name": "Two-body problem"}]}, {"name": "General relativity", "children": [{"name": "Einstein field equations"}, {"name": "Evolution equation"}, {"name": "Geodesics", "children": [{"name": "Gravitational deflection"}, {"name": "Penrose limit"}]}, {"name": "Gravitational collapse", "children": [{"name": 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