Hour circle
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Connections
epoch
Entity
astronomy
Entity
star
Entity
planet
Entity
longitude
Entity
astronomical object
Entity
equinox
Entity
globe
Entity
radian
Entity
celestial sphere
Entity
declination
Entity
right ascension
Entity
celestial equator
Entity
right angle
Entity
great circle
Entity
Earth's rotation
Entity
perpendicularity
Entity
center of mass
Entity
celestial pole
Entity
Delft University of Technology
Entity