VOL. Xr.] PHILOSOPHICAL TRANSACTIONS. 281 



h. m. s. 



Itshalfis 42 10 



Hence the middle of the eclipse 3 20 15 



Agreeing with the former determination to the quarter of a minute. 



We agree exactly with Mr. Flamsteed, in the situation of the shadow, and in 

 the magnitude of the eclipse. For it is observed by both of us, that the shadow 

 never went beyond Porphy rites, though it was deeply immersed in the penum- 

 bra. Next to Porphy rites is a small whitish mountain, which we then called 

 the Companion of Aristarchus, because it is scarcely distant by its own diameter 

 from Porphyrites. That little mountain was immersed in the shadow at 2*^ 51" 

 15^; and it emerged at 3*^ 8"^ 25'; and all the time between it was in the shadow 

 next to Porphyrites. We both of us observed also, that in the height of the 

 eclipse the shadow nearly reached to Corsica; yet was never covered by it, a 

 small interval being left ; the distance of which limit being taken from the 

 nearest limb of the moon, was 8' \T'\ whereas Mr. Flamsteed found the dis- 

 tance of the island itself a little farther from the same limb, being 8' 3Q". We 

 also observed the island, or rather peninsula, Macra to be a long time adjacent 

 to both the shadows. We noticed that this began at 3^ 28"^ 1 5% and that it 

 continued at the same distance for a quarter of an hour. 



A Transit of the Moon above Jupiter, Feb. 28, l67f. Old Slyle, in the Morningy 

 observed at Greenwich. By Mr. Flamsteed. N° 1 23^ p. 566, 



Correct time of Clock. Distances and Altitudes. 



h. m. s. 



4 20 15. . . . Jupiter's distance from the moon's bright limb 1& g" 



4 47 0. . . . The moon's diameter taken 31 30 



4 49 30. . . . Jupiter from the nearest cusp 26 28 



4 52 15 . ..Jupiter had passed over a right line drawn through 



the cusps, by a 10th part of the distance, or about 



3', as conjectured by the eye through the tube. 



4 56 O. . . . Jupiter from the cusp 27 33 



5 1 15. . . . From a right line through the cusps 7 53 



5 3 30. . . . From the cusp 28 22 



5 7 25. . . . From the right line g 58 



5 10 50. . . . From the same 11 55 



5 15 50. . . . From the cusp 30 27 



5 21 20. . . . From the farther limb, dubious 62 4 



5 26 O. . . . From the nearest cusp 33 q 



5 31 25. ... From the right line through the cusps 20 9 



VOL. II. O 



