BY THE MOON. 215 



It is to be remarked that at Porto-Rico the apparent center of the? Immer. 13 56 38 



meon passed to the North of Aldebaran supposing 2" of inflection. J Emer. 15 49 18 



m 'JL .curA.j, ? Immer. 10 55 35 



At Gotha to the South of Aldebaran > Emer. 12 20 35 



Difference of Latitude at conjunction f Porto-Rico. = 22' 55"9 7 _„-„<, 



with 2" inflection. I Gotha 22 58 7 $ ~ 



c • i~ r • o .• „ < Porto-Rico. 22 57 f _,, „ - 



Supposing 1 of inflection ^ Gotha 22 57 1 5 22 5 ~ 5 



It appears therefore that the center of the moon having pass- 

 ed at such a distance from Aldebaran and in different quarters, 

 the errors proceeding from the semidiameter of the moon, or 

 quantities of inflections, have contrary signs, thaUs if we sup- 

 pose l" more in the inflection, we diminish the difference of 

 latitudes at conjunction by the observations in Porto-Rico 1" 1 

 and augment it by those of Gotha l" <?, consequently we de- 

 termine at the same time both elements, which is reduced to 

 the following question : To find the horizontal semidiameter of 

 the moon at the moment of the conjunction; by applying the 

 corrections of the horary variations and the corresponding in- 

 crease of altitude, there results the same difference of latitude 

 at conjunction, by the observations at both places. By apply- 

 ing the calculation we find the inflection of the horizontal se- 

 midiameter of the moon=l" 0, and the difference of latitudes 

 22' 51" 0. At Figueras and Ferrol the apparent centers of the 



In its Immersion. Emersion. 



Moon and Aldebaran pass Ferrol. 2' 1" 3' 47" 



Figueras. 2 28 2 47 



These observations after having determined the difference of 

 latitudes at conjunction, are the most proper to determine the 

 quantity of inflection. 



By applying the calculation to the observations of Ferrol, 

 there results the inflection of the semidiameter of the moon. 



0" 9 

 Applied to the observations of Figueras. . 5 



To those of Porto-Rico and Gotha. ... 10 



Mean inflection. ..08 



According to Lalande, the inflection increases the semidia- 

 meter of the moon 2"; Mr. Du Sejour, after having calculated 

 the observations of Mr Short on the Solar eclipse of 1st April 



D 



