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User:DraculavanHelsing/Books/History of Astronomy2 O-Z

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History of Astronomy

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O-Z

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Observational astronomy
Occultation
Oort cloud
Opposition (planets)
Orbit
Orbital elements
Orbital inclination
Orbital mechanics
Orbital period
Orbital plane (astronomy)
Parsec
Percival Lowell
Phaeton (hypothetical planet)
Phases of Venus
Philosophiæ Naturalis Principia Mathematica
Planet Nine
Planet V
Planetary phase
Planets beyond Neptune
Poles of astronomical bodies
Precession
Primum Mobile
Proper motion
Ptolemy
Pythagorean astronomical system
Quadrature (astronomy)
Radial velocity
Retrograde and prograde motion
Richard A. Proctor
Roche limit
Rotation around a fixed axis
Rotation period
Rotational speed
Semi-major and semi-minor axes
Solstice
Spherical astronomy
Spherical Earth
Stellar parallax
Sublunary sphere
Theia (planet)
Themis (hypothetical moon)
Timeline of astronomy
Timeline of Solar System astronomy
Titius–Bode law
Transit (astronomy)
Triple conjunction
Turtles all the way down
Two-body problem
Tyche (hypothetical planet)
Tycho Brahe
Tychonic system
Urbain Le Verrier
Vulcan (hypothetical planet)
William Herschel
Zodiac