VARIATION or tHE COMPASS. 257 
Star’s R. A. increafed by 24 hours, - 24 49 
Sun’s R. A. computed to r" a. M. (taken 
from the nautical almanac, or any other 
table of the fun’s R. A.) fubtract Bete) rag 
True time of ftar’s paflage over meridian, 
reckoned from noon, - - 13. 24 
Hour of the night fubtraa, - ~ ot eG 
Time before ftar’s paflage,, - = Be 2a 
Which correfponds to true azimuth, 2° 23) E. 
Magnetic azimuth, = - O90) Hi. 
Variation of the needle, - 1 45 W. 
EXAMPLE II. 
~ In the latitude of about 32° north, on the 4th of July 
1785, at 48 minutes after 19 o’clock at night, fuppofe the’ 
magnetic azimuth of the pole ftar, to be 2° 40’ eaft; re- 
quired the variation of the needle. 
H.  M. 
Star’s R. A. + 24", - - - 24 49 
Sun’s R. A. - - - - 6 54 
Time of ftar’s pafling meridian, - 17 55 
Time of obfervation, - - ~ 190 648 
Time before ftar comes to meridian, = 7 a 
Which correfponds to true azimuth, 2° 4 E. 
Magnetic azimuth, - - 2 Ao; K, 
Variation, - = o 38: E. 
