ON THE EAETH’S MAGNETISM. 
387 
And for the sidereal periods of Venus and the Earth, the calculated values are: — 
Aggregates of Disturbances increasing the Horizontal Force, diminished by the constant value -0461 1 . 
Twenty-fourths of the period 
» 
1 
2 | 
3 
4 
5 
6 
7 , 
Venus 
-•00886 
-•00615 
© 
© 
© 
+•00209 
+•00520 
+•00657 
+■00637 
+ •00535 
The Earth 
-•00498 
+ ■00447 
+■01036 
+•01029 
+•00492 
-•00260 
-•00861 
-•01088 
Twenty-fourths of the period ...... 
8 
9 
1 10 
11 
12 
13 
14 
15 
Venus 
+ •00440 
+ •00417 
+ 
§ 
S 1 
+•00495 
+•00480 
+•00373 
+•00199 
+•00013 
The Earth 
-•00958 
-■00667 
- -00444 
-•00383 
-•00386 
-•00247 
+•00196 
+■00905 
Twenty-fourths of the period 
46 
17 
18 
19 
20 
21 
22 
23 
Venus 
-•00126 
-•00195 
- 00231 
- 00293 
- 00430 
-•00639 
-•00847 
-•00957 
The fEarth 
+•01624 
+•01992 
+•01745 
+•00888 
-•00274 
-•01267 
-•01672 
-•01349 
Aggregates of Disturbances decreasing the Horizontal Force, diminished by the constant value '27529. 
Twenty-fourths of the period 
0 
1 
2 
' 3 1 
4 
1 5 
6 1 
7 
Venus 
- 00738 
-•03359 
-•05313 
-•05480 
-•03645 
-•00632 
+ 02136 
+•03422 
The Earth 
-•01447 
+■00146 
+•01081 
+•01223 
+•00912 
+•00465 
-■00227 
-•01667 
Twenty-fourths of the period 
8 
9 
10 
11 
| 12 
1 13 
I 14 
15 
Venus 
+ 02855 
+ 01096 
— ■00581 
-•01047 
+ •00032 
+■02017 
+•03697 
+•04020 
The Earth 
-•04326 
-■08081 
-•11915 
-•14164 
-•13247 
-•08558 
-■00955 
1 
+•07405 
Twenty-fourths of the period 
16 
1 17 
18 
19 
20 
1 21 
| 22 
1 23 
Venus 
+ •02733 
+ 00514 
-•01430 
-•02080 
-•01239 
+ •00364 
1+01493 
+ 01165 
The Earth 
+•13906 
+•16575 
+•14921 
+•10079 
+•04200 
-•00547 
— -02903 
-•02876 
20. Eighty-two synodic periods of Mercury extend over 26 years, and the observations 
treated are those for the years 1847 to 1872. Fifteen synodic periods of Venus and 
twenty-two of Jupiter extend over 24 years, the years treated being 1847 to 1870. 
Table VI. — Values of the coefficients gb &c. for the synodic periods of 
Mercury, Venus, and Jupiter. 
Declination. 
Coefficients 
Easterly Disturbance. 
Pi- 
Si- 
j Pa- 
Sr 
Pa- 
Sa- 
Mercury 
Venus 
Jupiter 
+0-719 
+0-356 
-3-334 
-4-541 
-0-364 
-4-883 
+0-776 
+3-521 
+ 1-361 
-1-628 
-4-112 
-0741 
-3122 
-7-920 
+ 1-916 
+0443 
-3-402 
-1-676 
Coefficients 
Westerly Disturbance. 
Pi- 
Si- 
Pr 
Sr 
Pa- 
Sa- 
Mercury 
Venus 
Jupiter 
+M97 
-1-604 
+0251 
-2-889 
-1021 
+0-212 
+ 1-775 
+ 1160 
+0-189 
+0439 
+1-287 
-1-534 
+2-553 
+0-278 
+0-806 
-1-300 
-1-630 
+2-264 
3 f 2 
