BY J, J. DE FERRER. 349 



January Wth, 1808. Occultation of '» n by the moon. 



i • .1 j i i-_i. C Apparent time. 14'> 46' 11",4 



Immersion on the dark limb £ Mean time. . .14 54 32,0 



The disappearance was instantaneous — magnifying power 

 of the telescope, 75. 



January 27. By four series of double altitudes of Canopus, 

 near the meridian, observed with the circular reflector, correct- 

 ed by the horary angles, and refraction, the meridian altitude 

 was determined. . . . . 14° 28' 53,5" 



By 4- series of similar observations on Sirius. 50 36 54,4 



By 10 series of angular distances, observed with the circular 

 reflector, and corrected for refraction, the mutual distance was 

 determined =36° 17' 19,4". 



The difference of right ascension in time, of the above stars 

 = 16' 59,5". 



By the distance observed, and the difference of right ascen- 

 sion results the difference of declination. 36° 08' 00,4" 



The difference of meridional altitudes =d in- 

 ference of declinations, . . , . 36 08 00,9 



Taking tbe latitude of the place as stated above 22° 55' 16" 

 and correcting the meridional altitudes observed, from nutation, 

 aberration, and precession, we have the true, or mean declina- 

 tions of the two stars on 1st January 1808. 



Canopus. . . . 52° 55' 34,9" 



Sirius - 16 27 36,8 



Comparing the observations of la Caille on 1750, and sup- 

 posing the annual precession in longitude=50, 1" we have the 

 proper motion of Canopus in declination in 58 years — 0' 10,1" 

 Sirius. . . . +1 02,0 



Mean declination of Sirius, according to the Rev. Nevill Maskelyne 



on the 1st of January, 1808 • 16° 27' 30" 



Connoisance de temps 16 27 38,6 



By the observation with the circular reflector 16 27 36,8 



Astronomical observations made at the city of Havanna. La- 

 titude of the place 23° 08' 30". 



Occultations of stars by the moon, observed with an Achro- 

 matic telescope — magnifying power 75. 



April 5th, 1808. (C 1 a SB on the dark limb, apparent time. . . llh 53' 34'' 



May 2d, 374 of Mayer on the dark limb, ditto. . . 9 01 49 



3d, iu Lion on the dark limb. ditto. . 10 33 



Yh? immersions snr instantaneous- 



