Astronomy

The study of the heavens orders the soul: astronomical contemplation is training in reason itself.

The heavens are made of incorruptible matter and move in perfect circles; celestial and terrestrial physics obey fundamentally different principles.

Astronomy is a mathematical science that saves the appearances through epicycles, deferents, and equants, without claiming to describe physical causes.

The celestial bodies declare the glory of God, but astronomical knowledge is not necessary for salvation; faith rests on revelation, not the stars.

The earth is a planet orbiting the sun; the heliocentric hypothesis restores mathematical simplicity to the heavens.

Astronomy is part of physics; the planets move in ellipses, not circles, and their motions are governed by physical causes, not mere mathematical devices.

The telescope reveals that the heavens are not perfect and incorruptible; observational evidence confirms the Copernican system against Aristotelian cosmology.

Universal gravitation unifies celestial and terrestrial mechanics; the same force that drops an apple curves the moon's orbit.

The starry heavens above fill the mind with awe; reason can determine the conditions of possible experience but not the ultimate structure of the cosmos.