MATHEMATICAL GEOGRAPHY.

 

 

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ui ae

The drawing shows the order of the planets from
the sun their common centre, together with the
satellites or moons of some of the planets, and
the rings of Saturn.

8. Names of the Planets.—The planets, named
in their regular order from the sun, beginning
with the nearest, are as follows—viz.: Mercury,
Venus, Earth, Mars, Jupiter, Saturn, Uranus, and
Neptune. The first four—Mereury, Venus, Earth,
and Mars—are comparatively small; the second

_four—Jupiter, Saturn, Uranus, and Neptune—are

 

 

 

very large, Jupiter being nearly fourteen hun- —

dred times larger than the earth. The initial
letters of the last three planets, Saturn, Uranus,
and Neptune, taken in their order from the sun:
s, u, and n—spell the name of their common
centre.

* Mercury has a mean or average distance of 36,000,000
of miles from the sun; Venus, 67,200,000; Earth, 92,900,000 ;
and Mars, 141,500,000.

Jupiter is 483,000,000; Saturn, 886,000,000; Uranus,
1,781,900,000; Neptune, 2,791,600,000. The asteroids move
around the sun in the space between the orbits of Mars and
Jupiter.

 

* Calculated in round numbers for the mean svlar distance of
92,897,000 miles, :