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ELEMENTS OF FIELD ASTRONOMY - 14071_338
Celestial system of Coordination

Engineering Aid 2 - Intermediate Structural engineering guide book
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Figure  15-1.-Reference  lines. Figure  15-2.—Latitude,  longitude,  and  reference  lines. A great circle passing through both poles is called a equator is called a  parallel of latitude.  The  numerical meridian. The equator is a great circle about the earth value  of  the  parallels  defines  latitude  and  that  of  the equidistant from the poles and perpendicular to the axis meridians  defines  longitude. of  rotation.  Through  any  point  removed  from  the As shown in figure 15-2, geographic  latitude of a equator, a circle whose plane is parallel to that of the point may be defined as its angular distance above or 15-3







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