User:DraculavanHelsing/Books/History of Astronomy3 O-Z
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History of Astronomy
[edit]O-Z
[edit]- Observational astronomy
- Occultation
- Olbers' paradox
- 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
- Physical paradox
- 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
- Redshift
- 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