Occultation
This is when one celestial body, passes in front of, and obscures, another. This refers to the sam...
OccultationOpen Cluster
A group of young stars, possibly bound together by gravity. Over 750 of them have been recorded. It ...
Open ClusterOpposition
A planet is said to be "in opposition" when it appears opposite the Sun in the sky. For the outer pl...
OppositionOptical Binary
Not a true binary system; two stars which appear in alignment from the perspective of the Earth ...
Optical BinaryOrbit
The path of one body around another due to the influence of gravity. For two-body systems, the possi...
OrbitOlympus
In Greek mythology, the mountain that is home to the gods....
OlympusOnatah
In the mythology of the Native American Seneca and Iroquois people, a corn or wheat goddess; the dau...
OnatahOphir
In the Bible, a land to which King Solomon sent a naval expedition. Considered to be the eastern ext...
OphirOrientale
Latin for "Eastern". ...
OrientaleOvda
In Finnish mythology, a wild, ill-humored spirit who wanders through the forests looking for trespas...
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