■^J^ PHILOSOPHICAL TRANSACTIONS. [anNO I76Q,. 



f, Obsen^ationS of the transit of Places. Long, in time. I^atitude. 



Venus and Mercury over the Greenwich Observatory .. OO" 00™ 00^ 51^28' aZ-N 



- -^ Shirburn castle 3 4/ w 51 39 22 v 



J sun have been reckoned by as- Leskeard, Cornwall o is 47 w 50 26 55 n 



Itronomers (if the sun's parallax P«f •••;;,'•• ^^ ,? 1? ^ *® ^^ 'i ^ 



^ '^ Bologna, Italy 45 15 e 44 29 36 n 



is known) as very proper to Rome 49 38 e 41 53 54 n 



determine the difFerertbes of the Drontheini,.Ntinwiy .... . . o 44 16 e 63 26 10 n 



longjtudes of the places of ob- stockolm .;:...... . .'.., 1 .12 a7 e 59 20 30 n 



servation, even in many respects Hemosand l-'i .^ i--^i h - 7 e 60 38 n 



- , / ^ ,, , .• r Calraar .1 5 28 e 56 40 30 n 



preferable to the observations 01 Abo 1 2s is b 6027 On 



-Jupiter's satellites. I shall there- Tornea 1 36 44 e 6"5 50 50 n 



,. ^ , J • ^1 J Cajaneburg l. 51 47 B 6+ 13 30 s 



fore set down m the annexed Tobolsk, Siberia* 4 32 52 £ 58 12 22 n 



table the longitudes from Green- Madrid ..:..... :nv:>r^?. V(f 3 i)^ -^6 w 40 25 On 



. , , ° ^ , i.rc St. John's, Newfoundland+ 3 31 12 w 47 32 ir 



wich observatory of the difter- Madras ! 5 20 10 e 13 s On 



ent places, where the late tran- Rodrigues 4 12 34 k 19 40 40 s 



■ ^ r^T u 1 A Cape of Good Hope 1 13 31 e 33 55 42 s 



sitofVenuswasobserved, drawn Calcutta, Bengali 5 53 44 e 2230 on 



from the said observations. St Petersburg 2 1 29 e 59 56 On 



ban 



Tranquebar .,, 5 18 8 e 10 56 On 



Pondicherr>' 5 15 50 e 11 56 30 n 



-liiiii j;> osli; ; ' Kingston, Jamaica + 5 6 52 w 



,..^' Port Royal, Jamaica 5 7 2 w 



^ If the observation at Savile-house be compared with the observation of M. 

 de la Lande at Paris, the difference of longitude between the royal observatories 

 at Greenwich and Paris is = 9^ 16"^. 



' * The latitude of this place was sent to the Royal Society, but no longitude 

 of it, and therefore the internal contact at Tobolsk could not be compared with 

 that at the Cape of Good Hope for the purpose of the sun's parallax. 



-J- Mr. Professor Winthrop went, at the expence of the province of Massa- 

 chuset's Bay, to St. John's in Newfoundland, to observe the transit of Venus, 

 which he did with great care, and as much exactness as the low situation of the 

 sun at that time would permit. The internal contact happened there at 4*^ 47™ 

 17*. He had no other way of determining his longitude from Greenwich at that 

 time of the year, but by taking the distance of a star from the moon, which 

 gave hirii 3^ 20™ 56* for his longitude from Greenwich, and therefore his ob- 

 servation of the internal contact could not be compared with the same observation 

 at the Cape. 



J The longitude of Kingston in Jamaica is determined by the observation of 

 the transit of Mercury over the sun on the 25th of October 1743 o. s. men- 

 tioned in the Phil. Trans. : the effect of the parallaxes is considered, and here 

 included. 



The longitudes of Tornea and Madras are determined from the contact at the 



