and Transit of Mercury in 1832. 29 



App. time of Berlin. 



Beginning of the central (annular) eclipse 9" 1 3^ 



in 160° 23' east longitude from Ferro. 

 8 8 south latitude. 



Annular eclipse at noon 11 1* 



in 223° 25' east longitude from Ferro. 

 15 12 south latitude. 



End of the central eclipse on the earth 13 6 



in 280° 47' east longitude from Ferro. 

 11 51 north latitude. 



End of the eclipse on the earth in general 14 13 



in 264° 19' east longitude from Ferro. 

 11 10 north latitude. 

 Visible in the Pacific, the western parts of America, andthe 

 Isthmus of Panama, as also in the eastern parts of New Hol- 



Paramatta, Beginning 1 7 H8' app. time of Paramatta. 



End 19 40 



Magnitude 4 inches. 



Mexico, Beginning 4 28 app. time of Mexico. 



Middle 5 35 at sun-set. 



Magnitude 8*7 inches. 



Transit of Mercunj over the Stm's Disc, May 4 and 5, 1832. 

 •^ ^ App. time of 



Entrance of the centre of Mercury on the sun's Berlin, 



disc, seen from the centre of the earth, May 4, 21 "58' 20" 



Shortest distance 8' 0"-5 May 5, 1 22 53 



5 's centre leaving the O's disc — - 4 47 8 



At tlie moments of the centre of ^ entering upon, and 

 leaving the sun's disc the sun is respectively in the zenith of 

 the places whose geographical position is 



61° 28' east of Ferro' 16° 18' north latitude. 



319 16 ..'. 16 23 



All Europe and the greater portion of Africa see the whole 

 duration, Asia only the beginning, America only the end of 

 this transit. 



In order to calculate the effect of parallax on the time of 

 beginning and termination for any place in latitude i^, and 

 east longitude from Ferro Z, we may find the angular di- 

 stance of this place from a point whose 



east longitude from Ferro =X= 166° 18*8 



north latitude = /3 = + 53 57 '0 



by this formula: 



cos ? = sin /3 sin 4) + cos /3 cos 4) cos (X— /) ; 

 then the actual entrance of ^'s centre on the O's disc will 

 take place at the apparent time of the place of observation : 

 May 4. 19» 54' 6" + ^ - 118"-8 cos ?. 



For 



