lo ME M O IR S of the 
7 years depreffes Mercury ii 47'' to the fouth^ and 7 whole 
days, left by 9', Iboner, if there have been two intercalations 5 
but with one intercalation, viz. when the former year is biflex- 
tile, 6 days are to be fubdu»5ted, adding only 9' as before : It is 
more rarely that after 6 years this planet is feen again in the fun*s 
difk- after that period it palTes 50' 5c'/ more northerly 5 and 
that later by 9 d. 17 h. 25 m. if the preceeding year be the fe- 
cond or third after bifrextile3 otherwile 8 d. 17 h. 25 m. are to 
be added. 
Likewife if the conjun6iion happen at the defcending node in 
^pril. 
^ S ° If 
The longitude of the fun from the firft ftar of 7 , , ^ 
^ries^ - - - - _|o 15 44 00 
The longitude of Mercury feen from the fun 6 15 44 00 
The diftanceof the planet from the fun - 45508 
Its diilance from the earth — — 5 5/^99 
The motion of Mercury feen from the fun in? 
fixhouvs _ L _ _ I o o H ^9 
The motion of the fun in the fame time — o o 45 21 
. of il/^rr//r); from the fun — o o 28 52 
Hence the angle of the vifible way of Mer-'^ 
cury within the difk of the fun with the^ o 10 i8 00 
ecliptic is — — — — J 
And the vifible motion from the earth in 6 hours o o 2 $ 52 
Whence by following the method of the preceeding calculus, it 
is evinced that Mercury, after 13 years and befides 5 d. 7 h. 57 m, 
revolves to its conjunSiion with the fun; but if the preceeding 
year be the third after biffextile, in that cale 2 d. 7 h. 37 m. are 
only to be added 5 and then Mercury will be found to advance 
16' 55'' more Ibutherly ; After ^6 years vA/ith 12 intercalations add 
7 h. 14m. and Mercury will be in conjundlion with the fun 2' 23'' 
more foutherly 5 but if the former be biffextile, or the firfl after 
ix, id, 7 h. 14 m. are to be added, in order to have the conjunc- 
tion accurately: In like manner, after 2(^3 years, in which Aier- 
ctiry declines o' 22'' to thefouth, either id. 11 h. 49 m. or ri h. 
49 m. are to be added according to the rule prefcribed in the 
farmer cale : But in d or 7 years, becaufe of the nearnefs of the 
c?.rth and that planet, and therefore on account of the enlarged 
arches at this node, it does not return to the fun, fo as to be leen 
within its dift; After ^,3 years it pafles over the fun 14' 2.'! more 
noitherlv, and the moment of the conjundion is had by lubflra£l- 
