Mr. Bowditch on the solar eclipse, Sept. V7, 1811. 
265 
West from Greenwich, that part of Salem where my observations of 
the eclipse of Sept. 17, 1811, were made is in the longitude of 4h. 43’ 
367, and where Mr. Lambert observed must be in the longitude of 
4h. 43’ 34'0. 
servations. 
Observations at Salem, Sept. 17, 1811. 
The following elements of the eclipse of Sept. 17, 1811, corres- 
These longitudes are used in reducing the Salem ob- 
ponding to the beginning and end of the eclipse as observed by me in 
Salem, were calculated from the tables of Burg and ‘Delambre, pub- 
lished i in a Vince’ s > Astronomy. 
= oid 
Sores Tie es ae 
Apparent. of observation 
Mean times of observation 
Longitude west from Greenwich 
Mean times of observation reduced to Gresunich 
©’ s longitude from the arent ers 
©’s horizontal parallax 
©’s peyidigmetsne locate 3"°5 
©’s horary motion - 
Apparent anita of the ‘ettmsic 
D’s longitude from the apparent equinox 
D’s latitude north increasin is 
D’s horizontal parallax — 4-92 reducton for Salem 
») 's Semidiam. — inflex. 2”--aug. Lig: 53& atl 
)’s horary motion in longitude* 
)’s horary motion in latitude 
)’s horary motion pee the sun in n tongitude 
D’s parallax — ©’ sp 
©’s right ascension 
Horary increment of °” S Fight ascension in time 
Horary increment of )’ 8 horary motion in long. 
Horary decrement of }’s horary motion in a 
Horary increment of }?’s horizon ax 
Horary increment of ‘)’s semidiameter 
{)—0O) parallax in longitude 
(2 —©) parallax in latitude 
sreesseeeesasenes — 
4 
Beginning. End. 
he h se on 
0551441 3 59 001 
049 48:4! 3 53 31+5 
4 i a 7| 443 36°7 
5 33 25:1 | 8 37 08-2 
73°59) 314 174°00 504 
3°7 8°77 
15 53°75 15 53°78 
26°55 2 26°56 
23 47 41-9 
173 18 13-1 |174 48 41-5 
33 18-0 “41 37°5 
53 54°98) 53 55°88 
14 52°80 14 48-22 
29 32°41 29 33°43 
2 43°33 2 42°91 
27 05+86 27 06°87 
A. 53 46°21) A. 53 47°11 
11 37 33°9 | 11 38 01°3 
8°95 
0°32 0°36 
0°14: O18 
0°29 029 
— . O08}. 008 
A 87°99 17 18°3 
» 85 $14 46 O7*1 
_* These horary motions are for one hour mean time, all the calculations i in 
this paper being made for mean time, the computed conjunction being reduced 
© apparent time at the end of the computation. 
