24 PHILOSOPHICAL TRANSACTIONS, [aNNO 1763. 



the longitudes of other places he Tobolsk and Savile-house/ London 4* 33"" 37' w. 



has consulted the Phil. Trans. T^:.:v.:::':::::::::l le ^tZ: 



and theConnoisancedes Temps. Tranquebar o 46 9 e. 



These differences of longitude "P*^^ ^ ^^ 40 w. 



are as annexed. 



Mr. S. has deviated from the above-mentioned method of M. Pingre in 

 settling the longitude of Stokolm, by the ingress, because it appears clear to 

 him that there must have been a mistake in the observation of the internal con- 

 tact at the ingress at Stokolm, owing, as mentioned in his former paper, to the 

 small altitude of the sun at the time of the ingress: for by comparing the times 

 of ingress and egress observed at Stokolm and Upsal, we find that the difference 

 of longitude between these two places is l™ 39% and 1"* 59*, and as we are sure 

 that the observation at the egress gives the difference of longitude the most cer- 

 tain in this case, therefore it follows that the error was at the ingress, and it is 

 easy to prove that the error is in the observation at Stokolm. 



To avoid all uncertainty, and to be as clear and distinct as possible, he sets 

 down, in the following table, the observation at the egress at each place com- 

 pared, the difference of longitude between each place compared, the effect of the 

 parallaxes resulting from the comparison, and also the effect of the parallaxes com- 

 puted on a supposition that the sun's parallax is = 8".5, in order that if there is 

 any mistake it may the more easily be discovered. He compares Cajaneburg with 

 18 places, Bologna with 17 places, and Tobolsk with 18 places. He has explained 

 the manner of these in his former paper on tiiis subject, to which he refers. He 

 then sets down the result from each comparison in the following order, that they 

 may be the more easily seen. 



Sun's parallax. Sun's parallax. Sun's parallax. 

 Caian. and Stokolm . . 8."50 Bolog. and Stokolm . . 8."65 Tobolsk and Stokolm 8."50 



Upsal 8.50 Upsal 8.35 Upsal 8.80 



Abo 7.33 Abo 8.7 1 Abo 8.40 



Calmar... 8.64 Calmar . . 8.31 Calmar... 8.8'2 



Hernosand 9.27 Hernosand 8.36 Hernosand 9.02 



Tobolsk.. 9.06 Tobolsk.. 8.58 Gottingen 10.57 



Grottingen . 9.25 x Gottingen. 7-80 Greenwich yil 



Greenwich 9-09 Greenwich 7.77 Savile-house8.6ti 



Savile-house8.50 Savile-house8.30 Leskeard . . 8.34- 



Leskeard. . 8.06 Leskeard . 9.71 Paris 8.6O 



Paris 8.43 Paris 8..50 Florence. .. 7.99 



Bologna . . 8.4+ Calcutta . . 8.28 Bologna . . . 8.5.S 



Rome 8.14 G. Mount. 9.87 Rome 8 3i 



Florence . . 7. ('8 Tranquebar 8.86 Calcutta . . g.6i 



Calcutta . . 10.34 Madras . . 5.76 G. Mount 8.34 



G. Mount . 8.07 Cajaneburg 8.44 Tranquebar 8.55 



Tranquebar 8.36 Tomea . . . 8.23 Madras . . 9.54 



Madras . . 9.7 1 Cajaneburg 9.07 



* The latitude of Savile-house, London, is = il" 30' 50"n. The latitude of Florence is = 43» 

 46' 30" N. and that of Gottingen = 51° 31' 54" n. The latitudes of the rest of the places are «et 

 down in Mr. Short's former paper on this subject, only that of Tranquebar should be = 1 1° 30' <f. 

 — Orig. 



