Wikipedia:Dewey Decimal System/521
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Dewey Decimal System > 5 Natural Sciences and Mathematics > 52 Astronomy and Allied Sciences > 521 Celestial mechanics
- Altitude
- Analemma
- Anomaly (astronomy)
- Apoapsis
- Apparent motion
- Apsides
- Armillary sphere
- Armillary
- Astrolabe
- Astrometry
- Astronomical conjunction
- Autumnal equinox
- Axial tilt
- Azimuth
- Celestial coordinate system
- Celestial equator
- Celestial mechanics
- Celestial navigation
- Celestial pole
- Celestial sphere
- Circle of latitude
- Declination
- Deferent and epicycle
- Eccentricity
- Eclipse
- Ecliptic coordinate system
- Ecliptic longitude
- Ecliptic year
- Ecliptic
- Elongation
- Equatorial coordinate system
- Fundamental plane
- Galactic coordinate system
- Geocentric model
- Geocentric universe
- Geographic coordinate system
- Great circle
- Heliacal rising
- Heliocentric model
- Hemisphere
- Horizontal coordinate system
- Hour angle
- Inferior planet
- Kepler's laws of planetary motion
- Lagrangian point
- Latitude
- Longitude
- Lunar eclipse
- Newton's laws of motion
- Nutation
- Obliquity of the ecliptic
- Orbital elements
- Orbital period
- Orbital plane (astronomy)
- Orbital resonance
- Orbital revolution
- Orbital speed
- Parallax
- Periapsis
- Planetary motion
- Planisphaerium
- Polar coordinate system
- Positional astronomy
- Precession
- Prime meridian
- Prograde and retrograde motion
- Prograde orbit
- Radial velocity
- Right ascension
- Solar eclipse
- Spherical coordinate system
- Sundial
- Zenith