Lines of longitude run north and south the prime

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Lines of longitude run north and south. The Prime Meridian, or the line of 0 degrees longitude, runs  through Greenwich, England. Longitude is usually specified as  an angular measurement East or West of Greenwich. Lines of longitude meet at the north and south poles. There are 24 lines of longitude. It takes approximately 24 hours for the Earth to rotate once on its axis. Recall that there are 360 °  in a circle. Since 24 divides into  360 °  15 times, each line of longitude is 15 °  apart. Figure 1. Terrestrial Longitude and Latitude The Horizon System The Horizon system is ’local to the observer’ because it doesn’t  involve any geographical coordinates. It is defined by the 
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coordinates Azimuth and Altitude as shown in Figure 2. Azimuth (Az)- Azimuth is measured eastward in degrees, beginning at the  direction North. North is at 0 degrees, East at 90, South at 180,  and West at 270. Altitude (h or A)- Altitude is measured from 0 °  to  ± 90 ° , + is toward the zenith, the  position directly above the observer's head, and - is toward  nadir, the position opposite the zenith. 
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