G84 EEPOETS OF ASTEONOMICAL OBSERVATORIES. 



Cracow, Austria. 



Cracoic Observatory. 



Longitude from Greenwich, l^^ 19>" 50^5 E. 

 Latitude, 50° 3' 50" K, 

 Director : ? 



Cronstadt, Russia. 

 I^ava I Astro nom ica I Ohserva tory. 



Longitude from Greenwich, ? 



Latitude, % 



Director : ? 



Danzig, rriissia. 



8tern warie. 



Observatory of the /Society of Naturalists (Naturforscliende Gesellscbaft). 

 Established in 1783. 

 Longitude from Greenwich, ]'' 14'" 39^3 E. 

 Latitude, 54o 21' 18" K. 

 Directors : J. A. KoCH, 1783 ; 

 E. Kayser, 1850. (?) 



Derpt (Dorpat), Eussia. 



ImperatorsJcaia Astrononiichesl'aia Ohservatoria. 



Longitude from Greenwich, 1'' 10"' 53^5 E. 

 Latitude, 58° 22' 47".4 I^T. 

 Directors: J. W. A. Pfaff, 1808; 

 F. G. W. Struve, 1813; 

 J. H. Madler, 1840; 

 T. Clausen, 1874; 

 L. SCHWARZ, 1878. 

 Founded in 1808, as a dependency of the University. In 18:j5 Fraun- 

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

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

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

 of this instrument the elder Struve accomplished his famous Mensurw 

 Micrometricw, published in 1837, and continued by his successor. 



