on the Planets Venus and Mars. 
3 l 
neweft tables, which after the laft improvements commonly 
^ive the true place of Mars within the fourth part of a minute. 
The error in longitude + iy" fignifies that the longitude in 
the tables is 1 7" too fmall ; and that thofe if' are to be added 
to the calculated longitude, in order to make it agree with the 
obferved longitude. 
Mean time at 
Copenhagen. 
Heliocentric 
longitude of 
$ . 
Heliocentric 
latitude of S • 
1788 
Mar. 9 
12 
J 3 
14 
16 
0 / t/ 
7 37 35 
7 29 7 
7 26 19 
7 23 35 
7 18 19 
0 / // 
4 15 12 28 
4 16 31 42 
4 16 58 8 
4 17 24 28 
4 18 16 5c 
i 50 49,1 N 
1 5 ° 53>5 
1 50 56,0 
1 S° 57,7 
1 50 56,7 
Error of the tables of 
M. de la Lande, 
in long. 
in lat. 
// 
// 
- 7 
- 3 
+ 2 
- 4>5 
+ 2 
- 3 
+ 3 
- H3 
- 4 
- 2,3 
Inclination 
of the orbit 
of $ . 
// 
1 5° 5 6 
i co c6 
t So 56,4 
1 So 57,7 
1 5° 56,7 f 
The inclination of Mars is taken in the tables of M. Cassini 
* c 5 q/ 54 // > in tables M. Lande and Dr. 
Halley i° 5 1 ' o". 
I (hall conclude this Paper with the oppofition of Mars 
according to the foregoing obfervations. The oppofition of 
Mars to the fun happened 1788, January 7, at 8h. 19 32 
true time ; the apparent geocentric longitude of Mars at that mo- 
ment = 3 s. 17 0 if 8 7/ , and the geocentric latitude = 4 4 3 
Saturn was in oppofition to the fun, Auguft 29, 20 h. 51 11 
true time; the apparent longitude ^ — 1 1 s. 7 ° 3 1 34 5 anc ^ 
latitude i° 33^ S. The new planet was in oppofition to 
the fun January 18, oh. 28' 33^ true time, the longitude = 
3 s. 28° io' f\ and latitude o° 34/ 35" N. 
