3© HIS TORT of the SOCIETT, 



feries of obfervations may be continued, which Dr Mackay 

 has begun with fo much dihgence and accuracy. 



According toDrMACKAY, the latitude, from a mean of 

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

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

 nac^ is about \\" too great, it is more exa6lly 57°. 8'. S^W and 

 this agrees to i- 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 

 corredlion 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'. (^\ which is 3'. 50'''' too 

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

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

 tude of Edinburgh 3°. 14'. 45^'' weft of Greenw^ich, as it is near- 

 ly, there remains 2° 8'. 45" \V. for the longitude of Aberdeen. 



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

 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 

 13' in the longitude. It is likely that the latter affedls the pofi- 

 tion of the coaft for a confiderable extent. 



1797- P^yf' CI. A Report concerning the Weather in 1796 was 



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



tlie weather of » • i r -r\ tt 



1796. Article 01 Fart II. 



APPEN 



