MATHEMATICAL PA PERS. 429 
Vii mem containing Obfervations of a Soler - Edif Otto- 
ber 27, 1780, made at Beverly: Aif of a Lunar Eclipfe, 
- March 29, 1782,—f a Solar Eclipfe, April 12, and of the 
` Tranfit of Mercury over the Sun's Difc, November 12, the 
_ fame Year, made at the Prefidenf's Houfe ia Cambridge. 5 
the Rev. Josupu Wk bali Pr jiden: of thel Uni 2 
DI 
Obstina. of a folar- eclipfe, O&ober 27, 1780, at Bier). 
ATTENDED to my clock for a number of days before 
the eclipfe, but more particularly on the 25th, 26th and 
27th. On each of thofe days, the ftate of the atmofphere was 
‘favourable for taking correfponding altitudes of the fun. I took 
a number of double altitudes, both of his upper and lower 
. limb, in Rap Shein «d AON, with Hadley's ofant, by 
reflection from a bowl-of very clear oil of tar, which was of 
fih a Peontfiehce as to "rere reb etn from the ; air, and in 
which, the folar image was extremely well defined. I noted 
ihe times by the clock, when the limbs of the two images of 
the fun NS came into contact. The conjunction of thec cen- 
| The E EC. for the gens the fan's declination, dur- 
‘ing the half interval between the forenoon and afternoon obfer- 
wations, was conftantly, applied. — — 
Obfervations of correfponding double altitudes of the v Oc- 
tober 2 5 
(o [835 2" ghz" 46! 6h47 44^ — 3^23'52 21 58! 54" 
Sun’s upper J8 39.40. 3:8. 8. 63838 31914. 1159 54 
limbi 842 0 31547 4347. 3 16 sah 14.58 53% 
6 
Sap 33125 629 2 À 31434 TE 58 54 
R 
