184 Astronomical and 'Nautical Collections. 



on this occasion. The subject deserves, however, to be care- 

 fully re-examined with respect to this induced polarity, which, 

 if its existence were confirmed, would tend to remove some 

 difficulties in the theory of a ship's attraction. — See Astronomi- 

 cal Collections, No. III. 



The planet Festo was in opposition, 13th January, 1821. 

 For 3d April, midnight at Paris, M. T., her AR. will be 



111°. 9' Decl. 27°. 9' N. Log.Dist. fr. 9 .33 - 

 April 7. 112°. 5' 26°. 3' .34 



11. 113°. 7' 25°. 56' .35 



Encke, in Bode, p. 225. 



Ju7io will be in g 24th July, 1821. Her place at midnight, 

 M.T., at Manheim, will be 



Von Staiidt, in Bode, p. 227. 



vii. Danish Standard of Length. Communicated by Professor 

 Schumacher. 

 The length of a pendulum vibrating seconds of mean solar 



