20 



REPORT ON 



Double Altitudes of the Sun for Time, observed at Rio Janeiro, Brazil, January gth, 1866. 



Index correction. 



13" 1 17 3 







47" 



40 









13 39 









5° 







> 2P 



14 3-5- 







48 













14 26.5 









10 







J 



15 43 







47 



40 







| 



16 8 









S° 







y 20 

 1 



16 29 







48 











16 53 









10 







J 



Ex. ther. 



74 



° 







At. 



ther. 



Refraction 





= — 



123' 



'.2. 







Parallax 





= + 



7-9 







359° IO ' 4o" 

 3° 



o° 16' 



15 



0" 



50 



359 !° 35-° 



15 



55-° 



Correction =4- 16' 45". o 



77 Bar. 29.94 inches. 



Sun's declination — 22 6' 24". 6 

 Latitude — 22 54 5. 



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 



47 u 



55 



.0 



7 h 



n m 



i9 8 -5 





7 



23.8 



7 



18 



43-3 



5 



J 5 



4.9 



2 



3 



38-4 



2 



52 



3°-7 



4 



56 



9.1 



Double Altitudes of the Sun for Time, observed at Rat Island, harbor of Rio Janeiro, 

 January gth, 1866. 



"1 Index correction. 



y 2© 



27™ 0" 







108 



27 20 







10 



27 42-5 







20 



28 4-5 







3° 



28 26.5 







40 



29 21 







108 



29 45 







10 



3° 5 







20 



30 26.5 







30 



30 48 







40 



Ex. ther. 



75 









Refraction 





= — 



39"- 8 



Parallax 





= + 



5- 1 



y 20 



359° IO ' 3°" 

 40 



. 40 



o° 



15' 5° 



5° 

 5° 



359 IO 3 6 -7 







15 5°-° 



Correction = + 16' 46". 6 



At. ther. 77 Bar. 29.94 inches. 



Sun's declination — 22 5' 37". 3 

 Latitude — 22 53 45. 



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 



108 20' 

 9 h 2S m 



+ 



Double Altitudes of the Sun for Time, observed at Monte Video, Uruguay, January 18th, 1866. 



o m 



26 8 -5 



45° 



So'- 



0" 



1 





Index correction. 









5i-5 





40 







y 20 



359° 



10' 30" 



0" 15' 



5o' 



I 



17 





3° 







1 





40 





40 



2 



3-5 



5-5 

 3° 

 56.5 

 46 



45 



10 



5° 

 40 



3° 

 10 





 

 

 

 



1 



[ 2 © 



J 





40 





40 



3 

 3 



3 

 4 



359 



10 36.7 

 Correction 



15 

 = + 16' 50 



43-3 

 '.0 



