3<54< CORRECTION OF 



of the moon, and in this case the solar disk would be visible to 

 the observer, before it would illuminate the moon, by a quan- 

 tity proportional to the product of the horizontal refraction of 

 the moon, and the relative apparent motion of J and ©. 



Appendix to the Memoir XXXVI, page 213. 



In the observations published at Berlin, are contained the 

 observations of the occultation of v 8 the 21st of October, 1793, 

 the same day when the occultation of Aldebaran took place. 

 The combination of these observations appears to me to be very 

 advantageous in determining the parallax of the moon. 



Observations of the occultation of y ». 



Immersions. Emersions. 



Meantime. Meantime. 



b / » ti / v 



At Figueras bv Mr. Mechain. . . 9 24 32 . . . 10 28 47,5 



At Milan 9 57 37 . . . • 11 04 27,1 



At Berlin 10 29 19,3 



Those of Aldebaran are inserted in page 213. 



By the comparison of 1 1 eclipses and occultations of stars, 



I determined the longitude of Berlin east of Paris. . . =44 09,5 



Figueras, by two occupations and a solar eclipse. * . . 2 32,8 



Milan, in the Connoisance de temps of 1808. .... 27,25,0 



Marseilles. ........ 12 08,0 



Gotha 33 35,5 



Marine Observatory at Paris. . 2,5 



Comparing the degrees of a meridian measured at Quito, 

 India, Sweden and France, I determined the ellipticity, or the 

 proportion of the equatorial and polar diameters of the earth, 

 to be 3 1 7 : 3 16, which I have made use of in these observations. 



Elements by the new tables published at Paris in 1806. 



h i t h i a 



Conjunction at Paris of 2 with y ft =10 48 39,8 conjunction with a tf 17 51 06,0 



ApparenfcJongitudeofj, 8 • 62°55 19,63 . . of =t » 66 54 37,25 



Apparent latitude of y » . . 5 45 13,0 S. . . of a 8 5 28 52,5 



Latitude of <£ as per tables . . 5 06 12,0 S 5 06 03,0 



Horizontal equatorial parallax of the S 57 57,5 ..... 57 42,6 



Horary motion of the K in longitude. 34 09,10 34 50,7 



Horary motion of the C in lat. towards South. 5,1 towards the North. . 7,7 



By the result in page 215 we have a difference of latitude 

 .it conjunction of Aldebaran =22' 51" and the correction of 

 •he latitudes of the new tables= — 7",5. 



