J$ ASTRONOMICAL OBSERVATIONS 



Dijlances of the Moon and Mars. 



Apparent Time correct. 

 Inch. Non. , „ h , „ 



4>7°,< o8 >5 = 28 -40,3 13.18.42,5 



4,65^21 =28,31,1 ^ 26.34,5 



4> 6 5 ,/ 1 5 = 28.26,7 I J^eLmlmeJuK. } & U 53>5 



4,65^21 =28.31,1 3 6 -49'5 



4>7°//°5 =28.37,7 41.06,5 



1779, 3d May, an Appulfe of the Moon to b Ophiuchi. 

 Difference of Declination, 



Inch. Non. , „ Apparent Time correct. 



4>7°„ 1 7 =28.09,9 10.22.58,1 



The itar was to the weft of the Moon's horn from 

 which the diftance was meafured, becaufe the micro- 

 meter could not take in the limb. 



Inch Non. , „ Apparent Time correct' 



4,60 „ 17 =28.09,9 10.22.51,1 



Examination of the Micrometer. 



h , Inch. Non. 



lft May, 19.29. leffer diameter of the Sun 5,2 N 13 

 Again - - - 5,2 „ 15 



Greater diameter - 5,2 u 23 



Again - - - 5,2 „ 24 



Hence mean diameter 5,2 u 17,5 

 There are twenty-five nonius to divide one twentieth 



of an inch. 



When the limbs coincided the zeros agreed. 



The ephemeris gives i5'.54",6forthe femi-diameter, 



therefore one nonius is equal to o",7294, 



1779, 23d November, an Eclipfe of the Moon. 



Apparent Time correct. 



Beginning - - 12.02.33,0 



Shadow well defined - - 03.36,0 



Ariftarchus 10.37,1 



InfuU 



