from an Eclipfe of the Sun . 
feconds, becaufe the latitude of the moon deduced from the 
obfervation is the fame 'with that of Greenwich. 
The obfervation of Mitau is likewife very interefting; it 
(hews the fituation of a diftant country, where no obfervation 
had been made before M. Beitler eftablifhed an obfervatory 
there. The obfervation of this able aftronomer is of fuch 
corre&nefs, that it furnifhes the fame latitude of the moon as 
the preceding ones ; confequently the difference of the meri- 
dians, which I thence deduce, may be confidered to be as exadt 
as that of Dublin. The difference is i h. 34/ 54" £, which 
becomes of the greater importance to geography, becaufe from 
Pomerania to Peterlburg no one point had been accurately 
determined before. 
The pofition of Berlin has been already determined by means 
of fome eclipfes; but the refults do not agree. The difference 
of S 3 ' 32", which I have deduced, not only agrees exadtly 
with that mentioned in Vol. IV*. of M. de la Lande’s Aftro- 
nomy, and which this famous aftronomer had deduced from the 
occultation of Antares obferved by himfelf in the year 1749 ; 
but it alfo comes fo near to the longitude mentioned by Meff. 
Lexell and Bernoulli, in the Ephemeris of Berlin, as not 
to differ by more than two feconds. 
The obfervation of Vienna gives for the difference of the 
meridians 1 h. f 31". Though this determination differs but 
1 " from that found in the Almanack of Milan, and in the 
Requifite Tables , yet the obfervations of the two phafes had not 
been very accurately made. 
Perinaldo in Italy is a place whofe pofition has not been as 
yet well determined. The tables requifite for the Nautical 
Ephemeris lay down this place at 30' 40" to the Eaft of Green- 
wich ; fome place it at 30' 20". The obfervation made by 
Vol. LXXIX. I M. 
