246 TRANSIT or VENUS 
relatively to each other during the time elapfed betweer 
their paflage to the fame thread. 
Obfervation de leclipfe de Lune. 
ON a fait ufage dans cette obfervation de la méme quart de cercle, et de laméme lunette 
qui avoient fervi pour l’obfervation de l’eclipfe de foleil. Ia marche de la pendule etoit ce-- 
pendant un peu differente parce qu’on y avoit touche. 
N° XXXII. 
An Account of the Tranfit of Venus over the Sun, Fune 3a, 
1769; as obferved at Newbury, in Maffachufetts ; by the 
Rev. SAMUEL WILLIaMs, A. M. 
HE tranfit of Venus over the fun, being one of the: 
moft uncommon and ufeful phenomena in aftrono-- 
my, I determined to make as careful an obfervation of it 
as I could. Early in May I received an invitation from 
Triftram Dalton, E{q. a gentleman of Newbury-Port, to 
obferve it with him. He had a feat at Newbury, in a 
high elevated fituation, very convenient for this purpofe, 
at which we agreed to make the obfervation. 'The wea- 
ther for feveral days had been dull and rainy, but clear 
ing up on Tuefday evening I went early on Wednefday 
to put every thing in readinefs. The regulation of our 
clock being an article of great importance, I was very 
careful to have it thoroughly examined, and well fitted 
up. To adjuft it to apparent time we took correfponding 
altitudes of the fun, both before and on the day of the 
tranfit. In thefe obfervations, it was eafy to arrive toa 
pretty great exaCtnefs; and as they were very numerous, 
the going of the clock was well afcertained by them, and 
found to be fteady and regular. The telefcope we had 
prepared was a reflector made by Nairne, magnifying 
about 55 times; a good inftrument, but not fitted with a 
, micrometer, 
