^6o Royal Society of hondort. 



a proper Idea of it in an extraft. We ihall only obferve tbal 

 the author here gives an account of planetariums ; the moft 

 remarkable town clocks by Hahn, Mollinger, Dienel, and 

 the works of Jacob, the celebrated Hutlig, a weaver of 

 Bunzlau, and of Droz ; alfo the automata of Vaucanfon, &c. 

 together with way wifers, pedometers, and other objefts of the 

 like kind. 



X. Bibliography of clock- and watch-making. — ^The author 

 under this head mentions not merely the titles of books, but 

 gives an extratl of their contents with critical remarks. 



LXII. Proceedings of Learned Societies, 



BOYAL SOCIETY OF LONDON. 



X HE following letter from Baron von Zach to the pre- 

 lident Sir Jofeph Banks, contains fume interetting informa- 

 tion refpefting the planet Ceres Ferdinandea. 



DEAR SIR, Seeberg Cbfervatory near Gotha, Ftb. 20, iRo2. 



I had the honour to fend to you my obfervations of the 

 new planet Ceres Ferdinandea made in January here. I take 

 the liberty offending the continuation made in February. 



Dr. Gaufs has corrected his elliptical elements of the orbit 

 upon my obfervations j here is what he has found fince my 

 laft letter to you. 



Epoch for the beginning of the year to the meridian of 

 Seeberg 



^P5f""]bothfidereal 



Greateft equation of the centre 

 Inclination of the orbit 

 Logarithm of half axis major 

 Eccentricity of the orbit 

 ^ean diurnal heliocentric and tropical motion 

 With thefe elements of the orbit, all the obfervations made 



by 



769-7924 



