You are seeing reference results for geocentric zenith because there's not a match on Dictionary.com.
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dictionary.reference.com/browse/zenith
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Because the Earth rotates and is not a perfect sphere, the geocentric zenith is slightly different from the geographic zenith except at the Equator and the poles.
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www.titulosnauticos.net/astro/Chapter9.pdf
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Thus, astronomical and geodetic zenith are identical in this case. The geocentric zenith is defined as the point where the extended local radius vector of the ...
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graphics.stanford.edu/projects/gantry/design/astronomic...
graphics.stanford.edu/projects/gantry/design/astronomical_terms.html
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Because the Earth rotates and is not a perfect sphere, the geocentric zenith is slightly different from the geographic zenith except at the Equator and the poles.
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www.ehow.com/about_5394730_zenith-sky.html
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The geocentric zenith is a position shown by drawing a line from the geometric center of the Earth through the observer. Because the Earth rotates and is not a ...
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books.google.com/books/about/Longitude_by_lunar_distanc...
books.google.com/books/about/Longitude_by_lunar_distances.html?id=mtoMAAAAYAAJ
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... cos2 Q cosec east and west equation equatorial horizontal parallax find the moon's Fomalhaut formula geocentric lunar distance geocentric zenith Greenwich ...
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asa.usno.navy.mil/SecM/Glossary.html
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star-www.st-and.ac.uk/~fv/webnotes/chapt13.htm
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This is geocentric parallax, or diurnal (daily) parallax (since it varies daily as the Earth spins around its axis). diagram. To an observer at O, the zenith angle of ...
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www.nadir.org/selbst/name.html
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Aug 31, 2011 ... Because the Earth rotates and is not a perfect sphere, the geocentric zenith is slightly different from the geographic zenith except at the Equator ...
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getwords.com/results/zenith%20in%20astronomy
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Because the earth rotates and is not a perfect sphere, the geocentric zenith is slightly different from the geographic zenith except at the Equator and the poles.
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celestrak.com/columns/v02n03/
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The local zenith direction is just a fancy way of saying "straight up. ... center, and the equatorial plane is more properly referred to as the geocentric latitude, φ´.
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