TOL. XI.J 



PHILOSOPHICAL TRANSACTIONS. 



31^ 



The same Eclipse observed by Mr. Immanuel Halton, at If^ngjield, about 10 

 miles North of Derby , in Lat. 53* 8'. 

 h. 



h. m. 



At 7 50 Nothing over the sun. 



7 50-i- The beginning exactly. 



7 52 The defect observable. 



9 O The digits 34-. 



m. 



11 Digits 3-rV. 

 21 Digits 2-fiA- 

 47-1- Not finished, but the end 

 just approaching. 

 Page 664. 



The same observed at Paris, by M. Cassini. 

 When the sun emerged out of the clouds, approaching to an altitude of 48*, 

 I directed my quadrant to him, and kept it fixed at that altitude. From the 

 time that the upper limb of the sun a touched the horizontal thread cd, fig. 4, 

 pi. 10, in the focus of the telescope, to the coming of the centre b, there 

 passed 104 seconds == ab or br. From the passage of the centre b, to that of 

 the upper limb of the moon o, were 11 sec. =: bs. From the transit of the 

 centre bj to that of the upper western horn e, were 25-i- sec. =. eh. From the 

 transit of the centre Z?, to that of the lower eastern horn i, were 93 sec. = ik. 

 Hence is determined the line of the horns ie, (independent of the variation), 

 and its inclination to the horizon Ik ; also the point of concourse p of a. tangent 

 to the moon with the secant iep, and the tangent itself po, being a mean pro- 

 portional between j& z and /> e. Also the angles noe, toi; and hence the angle 

 ioe, with the triangle ioe, inscribed in the circumference of the moon. — From 

 these and other astronomical principles I have deduced, that the beginning of 

 the eclipse at Paris ought to be at 7h. 55m. and the end at about lOh. 12m. 



The same Eclipse observed by M. Hevelius, at Dantzic. 



Beginning 



Greatest obscuration . . 



The end 



Duration 



Sun's semidiameter . . . 

 Moon's semidiameter. . 



Ditto 



Ditto 



Digits eclipsed 



