120 ASTRONOMY. 
On account, however, of the different eccentricities, as well as the different 
inclinations of the planetary orbits to that of the earth, the perigee and 
apogee for each planet cannot be always the same. The consequence of 
this is, that seen from the earth, the planets do not always appear of equal 
apparent size. Hach planet must appear greatest in its perigee, and least in 
its apogee. The difference for all the planes is approximately represented 
in pl. 14, figs. 16-35, according to the scale AB, whose larger divisions 
measure 25 seconds, the smaller 23. This difference at the time of perigee 
is the following :— : 
Distance of the Planets from the Sun, and apparent Diameter at time of 
Greatest Perigee. 
Figs eects | amar ee eh Geo- App ee in 
16 Venus, 20 | 62 
18 Jupiter, 316 | 46 
20 Saturn, 644 20 
22 Mars, 28 | 28 
24 Mercury, 160 12 
26 | Uranus, 1,392 4 
28 Pallas, 88 4 
30 | Juno, 80 Qi 
32 Ceres, 124. 2 
34 | Vesta, 92 + 
And for the time of Greatest Apogee. 
Figs Planets. vianentteatstctisllilchs. Yas odlliaunaty acts aaaia 
17 | Venus, 140 93 
19 Jupiter, ' 620 30 
pal Saturn, — 892 153 
23 Mars, 216 34 
25 Mercury, | 120 2 
27 Uranus, 1,696 34 
29 Pallas, | 368 | h 
31 Juno, 360 + 
33 Ceres, | 328 2 
A Vesta, 296 a 
39. Pl. 14, figs. 36-45, exhibits approximately the apparent size of the 
sun, as seen from the planets at their mean distances from him. To this we 
will add the apparent diameters in seconds. 
120 
