Mr. Bowditch on the Longitude of Cambridge, 259 
their observations made the beginning at Greenwich 54. 29’ 57”, and 
the end at 7h. 11’ $3'°5 apparent time. The beginning at Cam- 
bridge, in the latitude of 42° 23’ 28”, observed by Dr. Winthrop, was 
11h, 39’ 23”, end 2h. 45’ 09” apparent time. These make the con- 
junction at Greenwich at 5/4. 43’ 57’-6, and at Cambridge at OA. 59’ 
27""0 apparent time; whence the difference of meridians is Ah. 44’ 
30""6. 
The second observation is an eclipse of the sun of June 24, 1778. 
The beginning at Greenwich, observed by Dr. Maskelyne, was 3h. 
40’ 11”, and the end at 54. 25’ 12” apparent time. This was compar- - 
ed with the Rev. Mr. Paysons’s observations at Chelsea, in the lati- 
tude of 42° 25’ 11” N, and 26 seconds in time east from Cambridge : 
The beginning was at 9/. 6’ 42”, the end-at 11/. 38’ 23” apparent 
time. President Willard used only the time of the end of the eclipse 
at Chelsea, but upon examination it was found that the beginning gave 
very nearly the same result as the end, and it was thought proper to 
use both observatidns. ©The conjunction at Greenwich deduced from 
these observations is at 3. 35’ 52”*9, and that at Chelsea at 10h. 51'50""9- 
apparent time. Whence, by allowing 26” for the difference of 
meridians of Cambridge and Chelsea, the difference of meridians 
of Greenwich and Cambridge by this eclipse will be obtained, 4/. 44’ 
“The thitd observation used by President Willard is the transit of 
Mercury of Nov. 5, 1743, observed at Cambridge by Professor Win- 
throp: second internal contact at 84. 17'S” A. M. second external 
contact at 84. 18’ 58” A. M. apparent time. The same was observed. - 
at Paris, in the latitude of 48° 50’ 14” nearly, by Messrs. Maraldi, 
Cassini senior and junior, La Caille and Le Monnier, as in the Me- 
Moirs.of the Royal Academy of Arts and Sciences of Paris for 1743, 
