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in this axial-pencil through that location. The intersection of this plane with Earth's surface defines two
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passes through the nadir to contact both poles at the opposite ends. In another approach known as the
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extends from a celestial pole and passes through the zenith to contact the opposite pole, while the
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is the semicircle that passes through their zenith and the north and south points of their horizon.
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by
Richard Fitzpatrick, Professor of Physics, The University of Texas at Austin)
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A Modern
Almagest - An Updated Version of Ptolemy’s Model of the Solar System
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and horizon. Meridians, celestial and geographical, are determined by the
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On any given (sidereal) day/night, a celestial object will appear to
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of an observer's location. Consequently, it contains also the
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The
Amateur Astronomer's Introduction to the Celestial Sphere
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can be used to determine the time of its culmination (see
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The meridian on the celestial sphere. An observer's
138:There are several ways to divide the meridian into
218:, the vertical circle perpendicular to a meridian
27:Great circle passing through the celestial poles
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123:(either one east and one west of the
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154:, the meridian is divided into the
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30:For the geographical concept, see
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113:on this axis, there is a unique
317:Astronomical coordinate systems
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299:Local Horizon and Meridian. (
296:. Cambridge University Press.
242:"Local Horizon and Meridian"
152:horizontal coordinate system
135:for that location and time.
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292:Millar, William (2006).
211:Prime meridian (planets)
120:geographical meridians
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34:. For other uses, see
246:farside.ph.utexas.edu
188:comes from the Latin
107:Earth's rotation axis
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271:"The Local Meridian"
206:Meridian (geography)
105:passing through the
69:passing through the
32:Meridian (geography)
222:Longitude (planets)
194:Northern Hemisphere
133:celestial meridian
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18:Celestial meridian
109:. For a location
99:celestial equator
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16:(Redirected from
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173:and the local
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148:lower meridian
144:upper meridian
125:prime meridian
115:meridian plane
89:points on the
51:local meridian
47:upper meridian
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163:drift across
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167:culmination
140:semicircles
311:Categories
280:2024-01-21
256:2024-01-20
228:References
179:hour angle
184:The term
59:astronomy
200:See also
190:meridies
186:meridian
63:meridian
36:Meridian
322:Circles
131:is the
97:to the
91:horizon
65:is the
75:zenith
61:, the
87:south
83:north
79:nadir
85:and
77:and
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111:not
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