1911 Encyclopædia Britannica/Prime Vertical
PRIME VERTICAL, in astronomy, the vertical circle passing east and west through the zenith, and intersecting the horizon in its east and west points (see Astronomy).
See also Prime vertical on Wikipedia; and our 1911 Encyclopædia Britannica disclaimer.
PRIME VERTICAL, in astronomy, the vertical circle passing east and west through the zenith, and intersecting the horizon in its east and west points (see Astronomy).