The Astrology of Space - Matrix Software

The Astrology of Space
Horizon Sphere – A heavenly sphere based on the
plane of the observer’s local horizon (90° from both
the zenith and the nadir), but taken from the center of
the Earth.
Zenith – The zenith is the point directly overhead any
spot on Earth.
Nadir -- The nadir is the point directly beneath
(opposite the zenith) any spot on Earth.
Altitude – The angular distance of any body above or
below the plane of the local horizon. Altitude is
measured from 0° to 90° from the plane of the horizon
to either pole.
Azimuth – The angle measured around the 360°
circumference of the horizon, either east or west
(there are different practices). The azimuth of an
object as measured from the meridian plane of the
observer and a vertical plane through any body.
Prime Vertical – A great circle passing through the
zenith (north pole), nadir (south pole), and the east
and west points on the horizon.
Altitude Circles – Parallel circles of altitude, wither
north or south of the plane of the horizon.
Almuncantar – Parallel circles of altitude, wither
north or south of the plane of the horizon.
North Point – A point on the horizon to the north of
the observer, where the meridian plane intersects the
horizon.
South Point – A point on the horizon to the south of
the observer, where the meridian plane intersects the
horizon.
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