| At the horizon | 100 | |
| At fifteen degrees above | 68 | |
| At thirty degrees | 50 | |
| At forty-five degrees | 40 |
Its apparent magnitudes in the vaulted roof are as its apparent elevations; and it is the same with the moon, and with a comet.
It is not habit, it is not the intervention of tracts of land, it is not the refraction of the atmosphere which produces this effect. Malebranche and Régis have disputed with each other on this subject; but Robert Smith has calculated.
Observe the two stars, which, being at a prodigious distance from each other, and at very different depths, in the immensity of space, are here considered as placed in the circle which the sun appears to traverse. You perceive them distant from each other in the great circle, but approximating to each other in every circle smaller, or within that described by the path of the sun.
It is in this manner that you see the material heaven. It is by these invariable laws of optics that you perceive the planets sometimes retrograde and sometimes stationary; there is in fact nothing of the kind. Were you stationed in the sun, we should perceive all the planets and comets moving regularly round it in those elliptical orbits which God assigns. But we are upon the planet of the earth, in a corner of the universe, where it is impossible for us to enjoy the sight of everything.
Let us not then blame the errors of our senses, like Malebranche; the steady laws of nature originating in the immutable will of the Almighty, and adapted to the structure of our organs, cannot be errors.
We can see only the appearances of things, and not things themselves. We are no more deceived when the sun, the work of the divinity—that star a million times larger than our earth—appears to us quite flat and two feet in width, than when, in a convex mirror, which is the work of our own hands, we see a man only a few inches high.
If the Chaldæan magi were the first who employed the understanding which God bestowed upon them, to measure and arrange in their respective stations the heavenly bodies, other nations more gross and unintelligent made no advance towards imitating them.
These childish and savage populations imagined the earth to be flat, supported, I know not how, by its own weight in the air; the sun, moon, and stars to move continually upon a solid vaulted roof called a firmament; and this roof to sustain waters, and have flood-gates at regular distances, through which these waters issued to moisten and fertilize the earth.
But how did the sun, the moon, and all the stars reappear after their setting? Of this they know nothing at all. The heaven touched the flat earth: and there were no means by which the sun, moon, and stars could turn under the earth, and go to rise in the east after having set in the west. It is true that these children of ignorance were right by chance in not entertaining the idea that the sun and fixed stars moved, round the earth. But they were far from conceiving that the sun was immovable, and the earth with its satellite revolving round him in space together with the other planets. Their fables were more distant from the true system of the world than darkness from light.