644 



PHILOSOPHICAL TRANSACTIONS. 



43. 

 50. 



[anno 1769. 



Obs. of long. January 2Q, 1768, observed by the same person, at the same 

 place, with Short's 2-feet reflecting telescope, an immersion of the first satellite 

 of Jupiter, at 14 hours, 11 minutes, and 3 seconds, mean or equal time. 



XXXf^. Observations made on the Island of Hammerfost, for the R. S. By 



Jeremiah Dixon, p. 253. 



The Transit of Venus. 

 Time p- dock. 



1769, June 3, IS*" 40™ Saw the planet Venus on the sun about half immerged. 



Not totally immerged. 



The planet seemed to be completely on the sun, but no 



thread of light; this was an instantaneous view, and 



through a thin cloud. The air all this time very hazy. 



47. . Saw Venus on the sun's limb, the 2d internal contact 



being past. After this, all cloudy as before. 



The latitude of the observatory is, per observ. June 2, at noon 70° 38' 11" 



4, at noon 70 38 23. 



Note, The error of the line of collimation of the quadrant did not, on trial, 



appear to be any thing worth notice. 



The longitude of the observatory is, by comparing the observations of the 



eclipse of the sun with those made at Greenwich. 



Per 1st measurement with the micrometer 1" 34" 40"j 



2d ditto I 34 3.3 > 



3d ditto 1 34 44 J 



13th ditto 1 35 



1 5th ditto 1 35 



End of the eclipse 1 35 



19 



3.5 



44 



,U 



10 J 



These observations were made before the 

 middle of the eclipse. 



These observations were after the middle. 



1 34 55 = 23" 43' 45" 



east of the Royal Observatory at Greenwich. 



% 



XXXVJ. Astronomical Observations made at the North Cape, for the R. S. 



Mr. Bat/ley. p. 262. 

 From many corresponding altitudes the going of the clock is determined as 

 below. 



App. noon per clock, ' 



per equal altitudes. 



2" 53" 3l'.0 1' 1".0 



3 1 25 .2 52 .3 



3 28 59.2 43 .2 



49 .6 



May 



6 



8 



15 



20 



Jane 



3 

 9 

 10 

 II 

 15 

 18 



3 48 43 .9 



45 

 9 

 13 

 18 

 34 

 47 



5.1 

 46.4 

 56.9 



7.3 

 42.5 

 10.3 



Clock too slow for Rate of clock with 

 sidereal time. resp. tosider.time. 

 + 4".6 

 + 1 .2 

 - 1 .3 



13 .6 

 16 .6 

 15 .3 



13 .2 



14 .0 

 14 .2 



Mean rate of clock + .91 



Clock stopped. 



