684 REPORTS OF ASTRONOMICAL OBSERVATORIES. 



Cracow, Austria. 



Cracow Ohservaiory'. 



Longitude from Greenwich, l'^ 19'" oO^o E. 

 Latitude, 50° '6' 50" N. 

 Director : ? 



Cronstadt, Eussia. 

 JSfaval Astronomical Observatory. 



Longitude from Green wicli, 



Latitude, ? 



Director : ? 



Danzig, Prussia. 



Ster)iirarte. 



Ohservaiory of the ISociety of Naturalists (Xaturforschende Gesellscbaft). 

 Established in 1783. 



Longitude from Greenwich, 1'' 14"' 39\3 E. 

 Latitude, 54° 21' 18" N. 

 Directors : J. A. Koch, 1783 ; 

 E. Kayser, 1850. (!) 



Derpt (Dorpat), Russia. 



TmperatorsJcaia AstronomichesJcaia Ohservatoria. 



Longitude from Greenwich, T' 4G"' .53*^.5 E. 

 Latitude, 58° 22' 47".4 X. 

 Directors: J. AV. A. Pfaff, 1808 5 



F. G. W. Struve, 1813; 



J. n. Madler, 1840; 



T. Clausen, 1874; 



L. SCHWARZ, 1878. 

 Founded in 1808, as a dependency of the University. In 1825 Fraun- 

 hofer's equatorial, with an aperture of 9 inches and a focal length 

 of 13i feet, moved by clock-work, the largest and most powerful 

 refractor in the world at that time, was mounted there. AYith the help 

 of this instrument the elder Struve accomplished his famous Mensnne 

 ]\Iicrometrica\ published in 1837, and continued by his successor. 



