Washington, April lOth, 1849. 



To Joseph Henry, LL. D., 



Secretary of the Smithsonian Institution : 



Dear Sir : In compliance with your request, I have the pleasure to present 

 to the Smithsonian Institution the Ephemeris of Neptune for the opposition and 

 autumn quadrature of 1849. 



In order to make the series uniform, the Ephemeris for the date of the Lalande 

 Observations in 1795, and for the years 1846, 1847, and 1848, accompany that 

 of 1849. They are all based upon my second eUiptic elements of Neptune, the 

 origin of which is explained in my paper dated April 15th, 1848, which will form 

 a part of the Second volume of the Smithsonian Contributions. 



EPHEMERIS OF NEPTUNE FOR COMPARISON WITH THE ANCIENT LALANDE 



OBSERVATIONS. 



APPARENT PLACES AFFECTED WITH ABERRATION, FROM THE SECOND ELLIPTIC ELEMENTS. 



Greenwich Mean Noon. 



Neptune's Apparent 



Neptune's Apparent 



Date. 



Right Ascension. 



South Declination. 





o t If 



/ II 



1795, May 8th 



213 17.99 



— 11 20 53.57 



9th 



•212 58 46.48 



— 11 20 22.88 



10th 



212 57 15.40 



— 11 19 .52.45 



nth 



212 55 44.79 



— 11 19 22.20 



The apparent Right Ascensions and Declinations of Neptune for the time of 

 the transit over the meridian of the Paris Observatory, as observed by M. de 

 Lalande, and reduced by *M. Mauvais, afford the following comparison with this 

 Ephemeris: 



* See Comptes Rendus, April 19th, 1847. 



