A great circle of the celestial sphere whose diameter runs from zenith to nadir.
- The three vertical circle detail is very uniting.
- These vertical circles are more obvious at the surface.
- Alcabitius, which uses vertical circles, bears the name of the 12 th-century Arabian astrologer, Alchabitus.
For editors and proofreaders
Syllabification: ver·ti·cal cir·cle
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