In astronomy, astrology, and geodesy, the prime vertical or first vertical is the vertical circle passing east and west through the zenith of a specific...

There are two principal radii of curvature: along the meridional and prime-vertical normal sections. In particular, the Earth's meridional radius of curvature...

later largely replaced by the Placidus system. [citation needed] The prime vertical (the great circle taking in the zenith and east point on the horizon)...

marking the prime numbers. Ulam and Gardner emphasized the striking appearance in the spiral of prominent diagonal, horizontal, and vertical lines containing...

vertical, set by the apparent centre of gravity of Earth still points to (aligns with) the modern celestial meridian (the intersection of the prime meridian...

the prime vertical. The vertical circle which is on the north–south direction is called the local celestial meridian (LCM), or principal vertical. Vertical...

said to have devised a system of astrological houses that divides the prime vertical into 'houses' of equal 30° arcs, though the system was used earlier...

^{-1}\left({\frac {N(1-f)^{2}+h}{N+h}}\tan \phi \right)} where N is the prime vertical radius of curvature. The geodetic and geocentric latitudes are equal...

axis) and the polar radius (semi-minor axis), respectively. N is the prime vertical radius of curvature, function of latitude ϕ: N = a 2 a 2 cos 2 ⁡ ϕ +...

Vertex (band), formed in 1996 Vertex (astrology), the point where the prime vertical intersects the ecliptic All pages with titles beginning with Vertex...