on the Planets Venus and Mars. 
25 
Obfervations compared. 
Heliocentric 
longitude of 
CS $ . 
Reduced to 
1786. 
1781 
September 13 — October 1 
September 13 — October 4 
September 22 — OCtober 1 
September 22 ■ — October 4 
s * 0 / // 
8 14 42 42 
8 14 42 23 
3 14 42 29 
8 14 42 12 
s • . . .. 
Mean 
8 14 42 24 
8 14 44 53 
1784 
October 21 — September 20 
October 21 — September 25 
OCtober 21 — October 2 
October 21 — OCtober 4 
Mean 
8 14 43 38 
8 14 43 40 
8 14 43 42 
8 14 43 3 ° 
8 H 43 3 8 
8 14 44 34 
1786 
Auguft 19 — Augii ft 29 
Auguft 19 — Auguft 28 
Augnft 20 — Auguft 29 
Auguft 20 — Auguft 28 
Auguft 21 — Auguft 29 
Auguft 21 — Auguft 28 
Mean 
8 14 45 3 
8 14 44 28 
8 14 44 16 
8 14 44 0 
8 14 44 2 7 
8 14 44 3 6 
8 14 44 28 
8 14 44 28 
Hence the heliocentric longitude of the defending node of 
the planet Venus was , 1786, Augujl 25, at B h. 39 s "j 
8 s. 1 4 0 4.4' 38". I think that this place of the node is to 
be depended upon to 10 or 15 feconds. According to the 
tables of M. Cassini, the longitude of the node 8 s. 14 
48' 31", the difference, or the error, - f S 3 * According 
to the tables of Dr. Habley 8 s. 14 0 42' 39", the difference. 
4. \' 5p // . From the tables of M. de la Lande e> s. 14 
45' 15", the difference only — 3 ~l" ' 
V41,. LXXX. E 
In 
