( t "V v 
) 
at the Times of his apparent Ingrefs on the Disk, And, 
equating the Times, i find, that the Sun, Anno 1677, 
Ottob. 17* 2i h 34' io" T. aq. was, in 15*° 3 6' 55'/ 
and, confequently Mercury's Heliocentrick Place 
S 1 5° 2' 10": and, Anno 1 713, OElob. zy* zh 25' 30" 
T. aq. the Sun was in ni 1 6° 39' 43", and therefore 
Mercury , at that Time, in » 1 6° s f 30". 
Mercury therefore, in 4 6 Years with 11 Intercala- 
tions, and befides i d 4 h fi' 10", has made 19 1 Re- 
volutions to the Equinodial Points, and over and above 
i° 3' 20". But, by the Scholion to Trop. XIV. Lib. 
III. Natur. Thilofoph . Trincipia Math, the Motion 
of the Aphelion of Mercury , from the Equinox in that 
Time, is 40' 1 8 " 3 fo that there remains 2,3' 2" of True 
Anomaly to be reduced to the Mean : Now the Mean 
Anomaly of Mercury , in both Cafes, being 5 Jig. 
ii°, 23' 2" of True Anomaly gives 15' 24" Mean A- 
nomaly ^ which added to 40' i8 ,; becomes S5' 4 i,, ? 
for the Mean Motion above fo many Revolutions : and 
this is to be encreafed by 8" to reduce it to the Plane of 
Mercury s Orb, in ail 75' 5c". 
Hence, doubling the Interval, in 92 Julian Years 
i d 9 h 4^ 2.0", the Mean Motion of Mercury from the 
Equinox is 0 s i°5i' 40", from which, taking s° 44' 
So" the Motion in i d cp 42' 20", we have his Motion in 
92 Julian Years 11 s 2 6° 6' 50 ", and in 100 Years, 
2 s 14 0 2' 13", which is but 2c" more than I had fome 
Years fince printed it, in my Agronomical Tables fhort- 
iy to be publifhed, and differs but one Hour’s Motion 
therefrom in 3000 Years. 
The forementioned Proportion of the Diftances, viz. 
3 1 3 to 676 , is alfo between the Latitudes feen from the 
Earth and the Inclinations, or Heliocentrick Lati- 
tudes of the Planet : fo that 1' 20", at the Ingrefs of 
1677, gives s' V 3 and 3' 40" in 1723, becomes 7' 79" 
L 1 2 for 
