[ M7 ] 
h ' " 
The firft exterior Contad I 
The firft interior Contad . 
The neared Approach of the 
io 4 6 c 
Centres 
The laft interior Contad . i oi 7 ?\r 
The laft exterior Contad . i 02 51s clnoon - 
This Tranfit may be very aptly compared with that 
which happened on the 24th Day of October 1 697 *5 
as happening at the End of a remarkable Period in 
Mercury s Motion, by which he is nearly in the fame 
Situation, with refped to the Sun, at every Com- 
pletion of it. Dr. Halley in his Series of Moments, 
in which Mercury is joined to the Sun, &c. (publifhed 
in the Philofophical TranfaBions, N° 193 ) makes 
the Middle of this Tranfit at 1 1 / paft Six in the Morn- 
ing the 24th Day, or the 23d Day at 1 8 h 11 1 p.m. 
and the Diftance of the Centres of the Sun and 
Mercury io / 04". 
It may not be amifs.to examine and compare thefe 
Kumbers by fuch Obfervations as were made of this 
Tranfit, and may be depended on, and thereby to 
colled the Difference between Computation and Ob- 
fervation 5 and whatever Error arifes in Excels or 
Defed by a proper Application to the Tranfit of 
1743. it is imagined, will foretel it with a greater 
Degree of Exadnefs, than a Calculus from any Theory 
whatfoever. 
There was only the Egrefs of Mercury in the Tranfit 
of 1697. capable of being obferved in Europe 
* Mean Period 46 Years i* 5 43 ^ 42 'f 
■f Flarnftead's Hiji. CoeleJI. Lib. II. Fol. 32. 
which 
