78 



]MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



table. The same table contains also the computed zenit distances, obtained by subtracting from 



the de(!linations the latitude {<f=51°2ii' 3S"), the index error {i—W 10"), and the refractions, so 

 that the3' are comparable directly with the readings 2>er llneas diarjonales. The stars are arranged 

 here in the order of their zeuit distances or declinations, which makes apparent a regularly pro- 

 gressing effect of the Quadrant's deviation upon the times of transit: 



From this it is clear that the star Fl. 1220 (letter c) fits so well to the other stars as to ex- 

 clude also in this case the hypothesis of the disappearance of a star. 



12) 



B. Fl. 1232 (6"). 



In the note to this star Baily explains, from the inspection of the J\ISS., how Flamstiied, 

 baviug failed to record the time of transit at the Quadrant, tried to supply the right ascension for 

 the catalogue by an observation with the Sextant, but in so doing he took in its stead 5 Ursw 

 majoris. The right ascension in Flamsteed's British Gatalogue-^127o id' 30"— is therefore quite 

 wrong, and much too large. Baily says further: "I cannot find any star in any catalogue that 

 will correspond with the zenith distance observed by Flamsteed, and I therefore consider that the 

 star does not exist." If we take from Argelander's north zones the place of Dm. + 01° 1070 (7"'. 5), 

 which is also Fed. LL. 13G1, and reduce it to 1G90, we find 



0. Argelander's 9191 : 124° W 31" 

 Flamsteed's British Catalogue has (127 46 30 



; -)-61o 59' 1" 

 \; +61 50 



The star indeed transited, as from the record of the observation on 1090, January 23, is required, 

 soon after 4 i Ursw majoris, and before the two imperfectly observed stars, which have been con- 

 sidered above under the head of 7) and 8). We are now enabled to till up the gaj) between 3 and 6 

 Ursie majoris in the column of clock time, on page 287 of the Histoiia Ccelestis, II, as follows : 



which confirms the justness of the identification of stars B. Fl. 1232, 1198, and 1199. 



13) B. Fl. 1486 (5"'). 



This star, which in the British Catalogue passes under the name of 28 Sextantis, was observed 

 1702, February 28, at lO'' 48"' 3G», and Baily found in the original manuscript entry that the 4 

 (in 48™) had been originally a 5. There can be no doubt that the time should be corrected by 



