3© HIS TORT of the SOCIETT. 



fcrles of obfervations may be contimied, which Dr Mack ay 

 has begun with fo much dihgence and accuracy. 



According to Dr Mackay, the latitude, from a mean of 

 64 obfervations of the fun's meridian altitude, is 57°. 9'. 1*, or 

 becaufe the fun's femidiameter, taken from the Nautical Alma~ 

 tuic, is about i-f' too great, it is more exadly 57°. 8'. 5^i\ and 

 this agrees to ^ of a fecond with the mean of 8 obfervations of 

 the meridian altitudes of fixed ftars. 



The longitude, determined alfo by a mean of feveral obfer- 

 vations, is o'\ 8'. 32' of time, or 2°. 8' weft of Greenwich. 



Hence it appears, that the beft maps and charts require fome 

 correction in the pofition they aflign to Aberdeen, and proba- 

 bly to a great part of the eaft coaft of Scotland. Ainsley's 

 map places Aberdeen in latitude 57°. 5'. 9", which is 3'. 50* too 

 far fouth : It is however very exacfl in the longitude, which it 

 makes i". 6' eaft of Edinburgh ; fo that, reckoning the longi- 

 tude of Edinburgh 3°. 14'. 45* weft of Greenwich, as it is near- 

 ly, there remains 2 ° 8'. 45'' W. for the longitude of Aberdeen. 



M. DE LA RocHETTE, in a chart of the north fea, conftrud:- 

 ed with great fkill and accuracy, lays down Aberdeen in lati- 

 tude 57'^. 5', and in longitude 2°. 21'. 31* weft from Green- 

 wich ; fo that there is an error of nearly 4' in the latitude, and 

 1 3' in the longitude. It is likely that the latter afFedls the pofi- 

 tion of the coaft for a confiderable extent. 



\m- Phyf' ^^' A Report concerning the Weather in 1796 was 



Mr Play fair on commuuicated by Mr Playfair. [See this volume, the laft 



tlie weather of - • i r t\ tx 



i;s6- Article 01 Part II. 



APPEN 



