The Age of Reason, page 69 by Thomas Paine
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70
But before I explain my ideas upon this subject, it is necessary (not for the sake of those that already know, but for those who do not) to show what the system of the universe is.
CHAPTER XIV
- SYSTEM OF THE UNIVERSE.
THAT part of the universe that is called the solar system (meaning the system of worlds to which our earth belongs, and of which Sol, or in English language, the Sun, is the center) consists, besides the Sun, of six distinct orbs, or planets, or worlds, besides the secondary bodies, called the satellites, or moons, of which our earth has one that attends her in her annual revolution round the Sun, in like manner as the other satellites or moons, attend the planets or worlds to which they severally belong, as may be seen by the assistance of the telescope.
The Sun is the center round which those six worlds or planets revolve at different distances therefrom, and in circles concentric to each other. Each world keeps constantly in nearly the same tract round the Sun, and continues at the same time turning round itself, in nearly an upright position, as a top turns round itself when it is spinning on the ground, and leans a little sideways.
It is this leaning of the earth (231/2 degrees) that occasions summer and winter, and the different length of days and nights. If the earth turned round itself in a position perpendicular to the plane or level of the circle it moves in round the Sun, as a top turns round when it stands erect on the ground, the days and nights would be always of the same length, twelve hours day and twelve hours night, and the season would be uniformly the same throughout the year.
Every time that a planet (our earth for example) turns round itself, it makes what we call day and night; and every time it goes entirely round the Sun, it makes what we call a year, consequently our world turns three hundred and sixty-five times round itself, in going once round the Sun.
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