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Read Ebook: First Lessons in Natural Philosophy for Beginners by Martindale Joseph C Joseph Comly
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Ebook has 2949 lines and 42988 words, and 59 pages
FIRST LESSONS IN Natural Philosophy.
The Earth and Other Planets.
What is the shape of the Earth on which we live?
It is round like a ball.
What other names are given to the Earth?
It is called the World or Globe.
What else is it sometimes called?
It is called a Planet.
Are there any other planets?
Yes; some of the stars are called planets.
Is our earth or world a star?
It is a star.
Why do the other stars seem to us different from the earth?
Because they are so far away from us.
What gives light to the planets?
The Sun gives light to the planets.
Of what is the sun the centre?
The sun is the centre of the solar system.
Do the planets remain in one place?
The planets do not remain in one place, but are always moving.
How do the planets move?
They move around the sun.
Are some planets nearer the sun than others?
Yes; some planets are much nearer the sun than others.
Which planet is nearest the sun?
The planet called Mercury.
Which is next to Mercury?
The planet called Venus.
And which is third in distance from the sun?
Our own planet, the Earth.
Are there any planets still farther from the sun?
Yes; Mars, Jupiter, Saturn, Uranus, and Neptune, and many smaller planets.
How does each planet move?
It moves in its own track or orbit around the sun, as is represented in Fig. 2.
Does the earth always move in the same orbit around the sun?
Yes; the earth moves in the same orbit around the sun, year after year.
How long does it take the earth to move around the sun?
What makes a year to us?
A year to us is the time required by the earth to move around the sun.
If the earth is in a certain place at noon, on New Year's day, when will it be in that place again?
What, then, does the earth do every year?
The earth moves around the sun and comes back to the place whence it started, once every year.
Has the earth any other motion than the one around the sun?
It has; it turns over and over.
Does the earth stay in one place as it turns over and over?
It does not; it moves on in its track around the sun.
How many times does it turn over while going around the sun?
Three hundred and sixty-five times.
How many times, then, does it turn over in one year?
The earth turns over three hundred and sixty-five times in a year.
What is the time which it takes to turn over once called?
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