JO REPORT ON 



Obserpations of the Sun, made January ^th, 1866, to determine the true bearing of the object used as 

 an azimuth mark in swinging the ship at Rio Janeiro, Brazil. 



Observations of the Sun, made January 2$d, 1866, to determine the true bearing of the object used as 



an azimuth mark in swinging the ship at Monte Video, Uruguay , 



Near sunset, when the true zenith distance of the sun was about 90, the angle between its nearest 

 limb and the Light-house on the Mount, on the west side of the harbor, was measured. The uncor- 

 rected reading of the sextant was 69 40', and the sun was to the left of the Light-house. 



