Prime vertical
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Connections
astronomy
Entity
International Standard Book Number
Entity
astrology
Entity
horizon
Entity
public domain
Entity
geodesy
Entity
zenith
Entity
nadir
Entity
perpendicularity
Entity
celestial meridian
Entity
Earth radius
Entity
Encyclopædia Britannica 11th edition
Entity
dead reckoning
Entity
Hugh Chisholm
Entity
Vertical circle
Entity