+ 1.0 



CO 



-1.0 I i 



270° 300° 330° 0° 30° 60° 90° 120° 150° 180° 210° 240° 270° 



ANGLE 



1200 1400 1600 1800 2000 2200 0000 0200 0400 0600 0800 1000 1200 



HOUR 



FIG 7 GRAPH OF THE SINE CURVE SHOWING RELATIONSHIP BETWEEN THE SINE FUNCTION 

 AND CORRESPONDING HOUR OF THE DAY WHEN THE 1800 HOUR IS EQUATED TO ANGLE 

 WHOSE SINE IS ZERO. 



17 



