e^ 



NUTATION OF THE EARTH'S AXIS, &c. 



The following table by attending to the direction will anfwer 

 for all flars. 



If the difference 

 bclefsthan 6* add 

 fornorthern ftars, 

 but fubtiad for 

 fouthern. 



Ifthedifferencebe 

 more than 6* fiib- 

 traifl for northern 

 flars, but add for 

 fouthern. 



For an example of the application of the foregoing equations, 

 let it be required to find the right afcenfion, and declination of 

 ^ Medufte for June 22d 1795; the Sun's longitude being 3^ 

 and the longitude of the Moon's afcending node 4% 



Right afcenfion of ,8 Medufse"? 

 the beginning of 1780. J 



Annual variation for 15 years 

 Do for June 22d. 

 Mean right afcenfion 

 Aberration 

 Nutation 



Equation of the equinoflial points 

 True right afcenfion 



Declination of /3 Medufae the" 

 beginning of 1780. ' 



Annual variation for 15 years 

 Do for June 2 2d 



Mean declination 



Aberration 



Nutation 



Semi-annual equation 



True declination 



' 13° 29'7".o 

 + 14 22.9 



_+ i7:0_ 



J3 43 569 



— 9-35 



— 0.67 



— 14.14 



I am, Sir, 



Your real Friend, 

 ANDREW ELLICOTT. 



T« Robert Fatterfm, A. M. 



A Letter 



