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Earth (Name applied to the third)

the name applied to the third planet in order from the sun. Τα the eye it appears as if the earth was in the center of the universe, the sun and the stars revolving round it. The phenomena are much better accounted for the celestial vault to be produced by an actual rotation of the earth on its axis in about 24 hours, producing day and night.

In possessing a satellite (the moon) the earth resembles various other plan- ets, except that they have more attendant bodies than one. In fact, the earth is a planet, and, like other planets, its figure is not far from spherical, as is proved by its having been sailed round. Magellan led the way, having circumnavigated a great part of the globe between 1519 and 1521, being killed in the Philippine Islands in the last-named year. Sebastian del Cano, one of his officers, completed the enterprise. terprise. Sir Francis Drake returned alive from a similar enterprise successfully carried out between 1577 and 1579 or 1580.

The sight of the masts of a vessel ap- The sight of the masts of a vessel apa proof that at least that portion of the world visible to us is a curve. Moreover, in an eclipse of the moon the shadow of minary is found to be circular, and there are other arguments in the same direction. Only in a broad sense can the earth be described as spherical; it is really an oblate spheroid- i. e. i. e., the distance between the two poles is less than tance between the two poles is less than eter drawn through the equator. This form may have been produced by the rotation of a partially fluid sphere. Actation of a partially fluid sphere. Actorial diameter is 7,925.604 miles, the lesser or polar one 7,899.114 miles; the torial diameter is 7,925.604 miles, the pression, is 26.471 miles, and the prodifference of diameter, or polar comdiameter as 299.15 to 298.15. The dimensions given by Sir R. Airy slightly differ from these. The force of gravity at the poles is to that at the equator very nearly as 180 to 179.

It is not of uniform density, the at the poles is to that at the equator very nearly as 180 to 179. It is not of uniform density, the increasing in density as they approached the earth's center, and, taking it for granted also that the attractive force might be calculated on the law of liquids, proved that the amount of gravity at the poles to that at the equator is as 180 to might be calculated on the law of liquids, proved that the amount of gravity at the almost exactly agrees with the result 179, and that the earth's polar axis was mean density of the earth, taken as a whole, to be about twice that of the parts near the surface. Henry Cavendish, Dr.

EARTHQUAKE R. Airy believed it 6.565, that of water being 1. The number of cubic miles in density of the earth to be 5.67, and Sir cubic mile containing 147,200,000,000 cubeing 1. The number of cubic miles in cubic mile containing 147,200,000,000 cuthe earth is about 259,800,000,000, each bic feet.

The surface of the land is to that of the water on the earth in the proportion hemisphere. The universal opinion of geologists is distributed, most of it being in the N. hemisphere.

The universal opinion of geologists is but a few thousand years old now exists tiquity. The old view that our planet is ever taken place since the first establishproved that astronomical changes have ever taken place since the first establishment of the solar system seriously to earth. The action of the earth on magnetic earth.

The action of the earth on magnetic substances is like that of a magnet, and it has two poles different from the ordinary poles.