Chapter 11b

The Balance Between the Aethers

The whole mass of the Earth is caused by the presence of the moon, and also about some particular things

Rene Descartes Rene Descartes
8 min read

In the same way, the stone R is so opposed to the quantity (exactly equal in size) of air-aether above it.

The stone would occupy the place of that air-aether if R moved farther away from center T.

  • That air-aether would necessarily have to descend to the extent that the stone rose.

That stone would then be opposed to an equal quantity of air-aether below it.

  • That air-aether would have to rise back the closer it gets to the center T.
  • This would then force the stone to descend.

The stone has no force to rise above the air-aether in the planetary gravitational territory because:

  • The stone has much more earth-aether than an equally sized air-aether has earth-aether.
    • To counterbalance this, the stone has less air-aether
  • The stone’s earth-aether is less agitated by the air-aether around it.

Instead, the air-aether around the stone has the force to make the stone fall by moving it towards the center T.

Thus, the small amount of air-aether in the stone is light compared to the earth-aether in the stone.

  • But when compared to pure air-aether, it is heavy

  • Consequently, it contains much less of the air-aether.

The World

Thus, each part of terrestrial bodies is pressed toward T.

Each body is pushed differently by the surrounding air-aether according to the quantity of the earth-aether that it has.

  • This push depends on the amount of air-aether beneath an earth-aether that can take its place as the earth-aether goes down.

“Homogeneous” bodies are those that act as one. Examples are physical air and water.

This is why:

  • the gravitational force of the air-aether is not noticably more in the deepest valleys than in the highest mountains.
  • a man in very deep water does not feel it weigh on his back any more than if he were swimming right on top.[52]

Why Don’t We Spin Off the Earth?

Why doesn’t the stone fall to the east 6 or west 7?

This is because all the terrestrial parts in the circle 5678 is being pressed toward T by the air-aether as one mass.

The parts of the stellar air aether have very irregular and diverse shapes.

  • These must join together and compose only one mass, which is borne as a whole by the territory ABCD
  • This is why, while the whole territory ABCD turns, the air-aether at 6 always remains opposite to those that are at 2 and at F.
  • They only shift one way or the other due to physical winds or other forces.

The air-aether at ABCD rotates much faster than the Earth.

  • But its air-aether that are caught in the pores of terrestrial bodies move just as slow as those terrestrial bodies around the center T

The air-aether pushes the stone R to center T because the air-aether tends to move away from the center with more force than the stone.

  • Yet the air-aether cannot force the stone to back up toward the West or East because it moves vertically in a straight line.

This downward force of the air-aether on the stone R cannot make it fall towards the West or East. This is because it focuses all its effort to make the stone move towards T according to the earth-aether contained in the stone relative to the air-aether that it has.

The stone travels in the same speed whether towards the East or West because the stellar-air-aether around the stone applies its force both on the air-aether and earth-aether there [as a unit, regardless of lateral direction].

Many philosophers say that:

  • if the Earth rotates then things would fall not in a straight line
  • cannonballs fired towards the West should travel much farther than if pointed towards the East
  • we should always feel great winds in the air and hear great noises [in the East]

This is because they do not know that the rotation of the Earth is carried by its gravitational territory.

Such arguments do not affect the motions that I am describing here.

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