MAGNETIC OBSERVATIONS. 



19 



Mean of chronometer times 

 Chronometer slow of local mean time 



Longitude west 



Chronometer slow of Greenwich mean time 



7 31 57-5 



2 36 34.8 



2 19 28.2 



4 5 6 3- 



Double Altitudes of the Sun for Time, observed at Bahia, Brazil, December z-]th, 1865. 



Ex. ther. 88 

 Refraction = 45". 9 

 Parallax = -f- 5.7 



At. ther. Bar. 



Sun's declination 23 19' 33". 8 

 Latitude 12 56 55. 



Mean of observed double altitudes 



Local apparent time ..... 



Equation of time ..... 



Local mean time ..... 



Mean of chronometer times 

 Chronometer slow of local mean time 

 Longitude west ...... 



Chronometer slow of Greenwich mean time 



+ 



98 40' o".o 



9 h I 4 m 22'. S 



i 27.3 



9 15 49.8 



6 53 43.0 



2 22 6.8 



2 34 0.5 



4 56 7-3 



Double Altitudes of the Sun for Time, observed at the Light-house in Fort St. Antonio, Bahia, Brazil, 



December 2<)th, 1865. 



Index correction. 



Ex. ther. 84 

 Refraction = 22".! 

 Parallax = + 3.3 



2Q 



2 Q 



At. ther. Bar. 



Sun's declination 23 

 Latitude 13 



13 



31". i 

 55- 



Mean of observed double altitudes 



Local apparent time 



Equation of time 



Local mean time 



Mean of chronometer times 



Chronometer slo> 



Longitude west . 



10 



