410 



HYDROGRAPHY. 



TABLE I. 



LONGITUDE OF CAMBRIDGE, DORCHESTER, AND WASHINGTON, DEDUCED FROM COR- 

 RESPONDING OBSERVATIONS OF MOON CULMINATING STARS IN CONNECTION WITH 

 THE EXPLORING EXPEDITION, 



DURING THE YEARS 1838, '39, '40, 41, AND '42. 



DATE. 



NAME OF STAR. 





CAMBRIDGE. 



DORCHESTER. 



WASHINGTON. 



1838. 







h. m. s. "' 



h. m. s. "' 



h. m. s. 



Dec. 25, 



0' Arietis, 



I 





4 43 56-82 





" 26, 



8 Arietis, 



I 





4 43 35-29 



5 07 53 18 



" 27, 



e Arietis, 



I 







5 08 16-63 





8 Arietis, 



I 







5 07 54-63 





rj Tauri, 



I 







5 07 47-63 





.4' Tauri, 



I 







5 07 59-63 



" 30, 



K Aurigae, 



II 







5 07 57-55 





t Geminorum, 



II 





4 44 07 - ll 



5 07 59-55 



" 31, 



<5 Geminorum, 



II 





A A 1 



4: <±-± Zi) U ( 







rj Cancri, 



II 





4 44 40-67 



5 07 46-86 



1839. 













Dec. 17, 



rj Tauri, 



I 





4 43 48 09 





1840. 













May 17, 



6 Scorpii, 



II 



4 44 34-99 





5 07 46-99 





a Scorpii, 



II 



4 44 32 99 





5 08 12-99 



« « 



A' Ophiuchi, 



II 



4 44 34-99 





5 08 07-49 





Ophiuchi, 



II 



4 44 27-99 





5 08 09 99 



June 13, 



8 Scorpii, 



I 



4 44 23-33 





5 07 55-83 





a Scorpii, 



I 



4 44 14 83 





5 07 54-33 





A Ophiuchi, 



I 



4 44 13-33 





5 08 00-33 





6 Ophiuchi, 



I 







5 08 03-83 



" 16, 



h a Sagittarii, 



II 







5 08 05-91 





c Sagittarii, 



II 



4 44 15 10 





5 08 04-41 



Nov. 2, 



u Capricorni, 



I 







5 08 08-93 





y Capricorni, 



I 



4 44 30 57 





5 07 45 93 





8 Capricorni, 



I 



4 44 18-37 





5 08 02-43 



" 6 > 



n Pisciunj, 



I 



4 43 57-76 





5 07 39 79 





w Piscium, 



I 



4 44 07-76 





5 07 55-29 





(JPiscium, 



I 







5 07 53-29 





e Piscium, 



I 







5 07 59-79 



" 13, 



d Geminorum, 



II 







5 07 55-94 





X Cancri, 



II 







5 07 41-94 





Cancri, 



II 



4 44 17-03 





5 07 56-14 





a Piscis Australia, 



II 



4 43 55-03 







