You searched for: “geocentric horizon”
geocentric horizon (s) (noun), geocentric horizons (pl)
In cartography, or maps, the plane through the center of the Earth: The geocentric horizon is parallel to the topocentric (a point on the surface of the Earth) horizon:
This entry is located in the following units: centro-, centr-, centri-, kentro- (page 6) geo-, ge- + (page 5)