Astronomical and Nautical Collections, 



DUt. computed by 

 Capt. Thomson's 

 method. 



Dist. computed by 

 the method in the 

 A pp. to Req. Tables. 



Dist. computed by 



Mr. 

 method. 



O 



22 



6 4|. .22 6 13 



o 

 22 



6 144 



^'sapp. alt. 15 



J's . . 18 



App. dist 22 



D's hor. par. 61 20 



^'s app. alt. 13 



D's . . 18 



App. dist. 20 



D 's hor. par. 54 . 



^'s app. alt. 13 



D's . . 14 

 App. dist. 20 



D 's hor. par. 61 20 



^'s app. alt. 7 35 28 



D's ... 7 55 31 



App. dist. 23 50 27 

 D 's hor. par. 54 . 



The small difference, which is sometimes found between Mr. 

 Lax*s results and those of the App. to the Req. Tables, arises 

 chiefly from the circumstance of the moon's parallax in altitude 

 having been computed by Mr. Lax from the apparent altitude 

 diminished by the refraction, instead of the apparent altitude itself, 

 as is done in the Req. Tables. 



In the following Example all the figures are written down, which 

 must necessarily be written down in the operation itself, in order 

 that the length of it in each method may be fairly exhibited. 



20 1 59 . .20 1 48 



^20 2 2 . .20 2 12 



29 51 16 . . 23 51 



20 1 48 



20 2 12i 



23 51 



o , ,, 



G*s app. alt. 41 47 26 



D's .... 9 54 34 



App. dist. 43 37 12 

 D s hor. par. 



547 



