Prime vertical: the vertical circle perpendicular to the meridian. It passes through the E and W points.
Primum Mobile: (pron. pree-mum mo-be-lay) an old term for the supposed crystal sphere carrying the stars in their orbits around the earth.
Prime vertical:
A great circle on the celestial sphere from the east to the west and passing through the zenith.
Prominence:
Cloud of gas elevated above the solar surface.
PRIME VERTICAL
The prime vertical is a great circle on the celestial sphere that passes through the . It is a vertical circle that is bisected by the . Degrees run from east to west.
prime vertical (NASA SP-7, 1965) The vertical circle through the east and west points of the horizon. It may be true, magnetic, compass , or grid depending upon which east or west points are involved. Also called prime vertical circle.
true prime vertical The vertical circle through the true east and west points of the horizon, as distinguished from magnetic, compass, or grid prime vertical through the magnetic, compass, or grid east and west points, respectively.
The arc of the horizon, contained between the vertical plane and the prime vertical circle, if reckoned from the east or west, or between the meridian and the plane, reckoned from the north or south.
7. Gram.
(an imaginary sphere extending outward from the Earth for an infinite distance and on whose surface the objects in space appear to be located) onto three planes at right angles (90) to each other--the horizon, the meridian, and the prime vertical.
Romer, on the other hand, deserves full credit for originating the transit-circle and the prime vertical instrument; and he earned undying fame by his discovery of the finite velocity of light, ...
 See also: Circle, Earth, Latitude, Great circle, Meridian
  
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