O stars
/ / / O stars / /
OB Associations
/ / / OB Associations / /
oberon
/ / / oberon / /
objective lens
/ / / objective lens / /
Occult astronomical software
/ / / Occult astronomical software / /
Occult watcher software
/ / / Occult watcher software / /
Occultation
/ / / Occultation / /
octant
ثمن / somn / / octant / octans / Oct
Omar khayyam
/ / / Omar khayyam / Omar ol-Khayyami of Nishapur /
Omega centauri
/ / / Omega centauri / /
Omid satellite
/ / / Omid satellite / /
Oort cloud
/ / / Oort cloud / /
open cluster
/ / / open cluster / galactic cluster /
Open universe
/ / / Open universe / /
ophelia
/ / / ophelia / /
ophiuchus
مارافسای / مارگیر / / ophiuchus / serpentarius / Oph
Opposition
/ / / Opposition / /
Optical axis
/ / / Optical axis / /
Optical plane
/ / / Optical plane / /
Optical tube
/ / / Optical tube / /
Orbital perturbations
/ / / Orbital perturbations / /
ORBITRON software
/ / / ORBITRON software / /
orion
شکارچی / / / orion / hunter / Ori
Orionid meteor shower
/ / / Orionid meteor shower / /
Orthoscopic eyepiece
/ / / Orthoscopic eyepiece / /
Oxygen
/ / / Oxygen / /
Eyepiece
چشمی / / / Eyepiece / occular /
m17
/ / / m17 / Omega Nebula / Swan Nebula
M97
سحابی جغد / / / M97 / Owl nebula /
mira
ستاره میرا / ستاره اومیکرون قیطس / / mira / o-ceti /
