And' LONGITUDE of ABERDEEN, 143 



inform them what tables I ufed for that piirpofe. The loga- 

 rithmic tables were Taylor's, Callet's, and Sherwin's. 

 From Taylor's Tables were taken the logarithm fines and tan- 

 gents of arches, and converfcly. The logarithm fines, and 

 converfely of the parallaxes, were taken from Callet's Tables : 

 and the logarithms of numbers from Sherwin's. By this 

 xneans much time was faved in thefe extenfive calculations. 

 The natural verfed fines were taken from my Treatije on the 

 Longitude ; and the augmentation of the moon's femidiameter 

 was taken from M. de Lambre's Tables^ for finding it by 

 means of tlie altitude and longitude of the nonagefimal, which, 

 therefore, faved the trouble of calculating the altitude of the 

 moon. The fun's parallax was taken from the Connoijfance des 

 Temps ; and, as I had not the Nautical Almanac for the year 

 1788, the elements for the folar eclipfe were taken from the 

 Connoijfance des Temps for that year ; but the elements for the 

 occultation were taken from the Nautical Almanac for 1787. 



Deter- 



