65 



Catalogue continued. 



Mean error of the catalogue in AR in space, by observations of the Sun in Spring and 

 Autumn, with the eight feet astronomical circle. 



Days 

 Obsr. 



Autumn, 1822 

 Spring, 1823 



Autumn, 1823 

 Spring, 1824 



Autumn, 1824 



10 ) " 



j- +0,40 +0,04 dL —0,06 dr —0,07 dO 



|__0,62 —0,11 dL +0,10 dr +0,14 dO 



I +0,34 +0,04 dL +0,10 dr —0,16 dO, 



18 

 18 



16 



18 



Spring, 1825 



Mean error of Catalogue =+0,04 — 0,01 dL +0,05 dr — 0,03 dO. 



Where dL = error in latitude, dr = error in constant of refraction, dO zs error in obliquity 

 of ecliptic. 



The small coefficient of dr shows that the error arising from the errors of division must be 

 absolutely insensible. 



L 2 



