BY THE MOON". i>17 



of Piazzi; and the place of the moon from the theory of La- 

 place. The horizontal parallax of the moon, from the state- 

 ments ot the tables of Lalande, in the third edition of his 

 astronomy, I have diminished 3" 1, conformably to the deter- 

 mination of Burg as mentioned above. 



I have also taken care to calculate the horary motions cor- 

 responding to the intervals between the immersions and emer- 

 sions, and between the true conjunction and the moments of 

 the immersions and emersions, the variation of the parallax, 

 semidiameter, equation of time and all the other elements, 

 which are subject to variation. 



Eltfnents of tlie 



Occult ation of Aldebaran by the moon. 



October 21st, 1193. 



Conjunction in Paris by the tables, Mean time. . . . 17 51 02 3 



i Apparent time. . . 18 06 29 3 



Apparent obliquity of the ecliptic • 23° 27 48 



Apparent longitude of Aldebaran. . . . . , . . 66 54 33 4 



Southern latitude of Aldebaran. . . - 5 28 49 



Southera latitude of the moon. 5 05 58 27 



Horary motion nf the longitude of the moon 33 50 15 



Horary diminution, of the horary motion in longitude. ... 2 66 



Horary motion of the moon in north latitude. .... 7 79 



Horary increase of horary motion in latitude. .... 1 77 



Proportion of the axes of the earth, as 333 : 334 ' " 



Horizontal parallax of the moon at Paris. 57 36 80 



Polar horizontal parallax. 57 32 30 



Horary variation of the parallax decreasing. . r . . . 2 30 



Horizontal semidiameter of the moon. ...... 15 45 



Horary diminution of the semidiameter of the moon 63 



Latitude of Aldebaran. Latitude of the moon. . . . . 22 50 73 



Right ascension of the sun. 207 13 54 



Horary motion of the right ascension of the sun 2 23 



Equation of time. . . . — 15 27 



Horary augmentation of the equation of time 34 



Horary motion of the moon between the immersion and emersion at Paris. 33 46 7 



Do. between the immersion and the true conjunction. . . . 33 49 1 



Do. between the true conjunction and the emersion. . . . 33 47 9 



Paris. T immersion and emersion. 9 9 



Horary motion in latitude between J- immersion and true conjunction. 8 4 



j true conjunction and emersion. 9 3 



Horary motion at Porto-Rico between the immersion and emersion. . 33 52 2 



immersion and true conjunction. 33 51 5 



true conjunction and emersion. 33 50 8 



Porto-Rico. 1 immersion and emersion. 6 4 



Horary motion in latitude between J- immersion and true conjunction. 6 9 



J true conjunction and emersion. 7 3 



