Reflection from an excess of horizontal prisms gives rise to a vertical circle passing through the sun.
A vertical circle is any great circle that passes through the zenith.
The altitude of a body is its elevation above the horizon, measured on a vertical circle.
The altitude of a celestial object is its distance above the horizon measured on the arc of a vertical circle.
If the wire, with its lines of force, be bent into the form of a vertical circle 1⅛ in.
The Azimuth of a star is the angle between the meridian and the vertical circle passing through the star.
The azimuth of a body is its distance, measured on the horizon, from the meridian to a vertical circle passing through that body.
The meridian is that vertical circle which passes through the north and south points.
In this event the cloud will exhibit no iridescence, but, instead of it, a vertical circle through the sun will present itself.
The prime vertical is that vertical circle which passes through the east and west points.
|vertical circle |
A great circle on the celestial sphere that passes through the zenith and the nadir and thus is perpendicular to the horizon.