Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy An
idealised conception of thecelestial sphere in which thecelestial equator isperpendicular to the localhorizon and theSun reaches thezenith at its highest point.
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
First attested in 1932; Latin: sphaera ("sphere”, “globe of the heavens") + rēcta (feminine nominative singular of rēctus, “right”, “upright”) = “upright sphere”.
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