180 



PHILOSOPHICAL TRANSACTIONS. 



[anno 1771. 



Extract from Capt. Cook's Journal. 

 1771, Nov. 9, at 8 a. m. Mr. Green and I went on shore, to observe the 

 transit of Mercury, which came on at 7^ 20™ 58^ apparent time, and was ob- 

 served by Mr. Green alone; I at this time was taking the sun's altitude in order 

 to ascertain the time. 



^ /Internal contact 12" 8"" 58 p.m. 



Mr. Lrreen ^ ^j^ternal contact 1 2 9 55 



p, „ , ( Internal contact 12 8 45 



U.COOK { External contact 12 9 48 



Lat. observed at noon 36° 48' 28", the mean of this and yesterday's observations 

 gives 36° 48' 54-" south, the latitude of the place of observation. The variation 

 of the compass was found to be 1 1° 9' east. These observations were made by 

 the help of a Graham's watch with a second hand ; corrected by observed alti- 

 tudes of the sun. 



XLV. The Transits of Fenus and Mercury over the Sun's Disk, June 4 and 

 Nov. 10, 1769, observed by John Maurits Mohr. Communicated by Captair 

 James Cook. From the Latin, p. 433. 



These transits were observed at Batavia in the East Indies; the observer being 

 furnished with good instruments made by the best English artists, Shelton, 

 Graham, DoUond, &c. Mr. M. used all the proper methods to rectify his in- 



