On the celestial sphere, what are the circles that pass through Zenith from the celestial sphere called?

On the celestial sphere, what are the circles that pass through Zenith from the celestial sphere called? Correct Answer Vertical circles

Vertical circles are the circles on the celestial sphere that passes through Zenith or Nadir from the celestial horizon. They are half circles made on the celestial sphere. Latitudes & Longitudes are the features pertaining to the planet Earth. Horizon is the great circle halfway of zenith & nadir.
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