The sun's mean distance from the earth is 92,900,000 miles; his diameter is 866,000 miles; his mean density, as compared with water, is 1·4; his ellipticity is insensible; he rotates on his axis in a period between 25 and 26 days.

The Moon.

The moon's mean distance from the earth is 239,000 miles. The diameter of the moon is 2,160 miles; and her mean density, as compared with water, is 3·5. The time of a revolution around the earth is 27·322 days.

The Planets.

Distance from the Sun in
Millions of Miles.		Periodic Time
in Days.		Mean
Diameter
in Miles.		Axial Rotation.Density
compared
with
Water.
Mean.Least.Greatest.
Mercury36·028·643·387·9693,030(?)6·85(?)
Venus67·266·667·5224·70 7,700(?)4·85
Earth92·991·194·6365·26 7,91823 56 4·095·58
Mars141 128 155 686·98 4,23024 37 22·74·01
Jupiter483 459 505 4,332·6 86,5009 55 —1·38
Saturn886 834 936 10,759 71,00010 14 —0·72
Uranus1,782 1,700 1,860 30,687 31,900Unknown1·22
Neptune2,792 2,760 2,810 60,127 34,800Unknown1·11

The Satellites of Mars.

Mean Distance from Centre
of Mars.		Periodic Time.
hrs.mins.secs.
Phobos5,800 miles73914
Deimos14,500 miles301754

The Satellites of Jupiter.

Mean Distance from Centre
of Jupiter.		Periodic Time.
days.hrs.mins.secs.
New Inner Sattellite Barnard112,500 miles0115722
I.261,000 miles1182734
II.415,000 miles3131342
III.664,000 miles734233
IV.1,167,000 miles16163211