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Wikipedia:Dewey Decimal System/521
Dewey Decimal System
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5 Natural Sciences and Mathematics
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52 Astronomy and Allied Sciences
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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
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
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