What is another word for vertical circle?
Pronunciation: [vˈɜːtɪkə͡l sˈɜːkə͡l] (IPA) 
Vertical circle is a term used in physics and astronomy to describe the path traced by a point on the celestial sphere that is directly overhead. This circle divides the sky into two hemispheres, the north and south, and is perpendicular to the horizon. However, there are several synonyms for vertical circle that can help describe this path in different ways. These include zenith circle, meridian circle, and prime vertical circle. Zenith circle refers to the circle traced by the point directly overhead, while the meridian circle is the line that runs from the north celestial pole to the south celestial pole and intersects the zenith. The prime vertical circle is the line that runs perpendicular to the meridian circle.
