Ptolemy

We should not be surprised if there are some errors in our maps, for the earth is vast and difficult to measure.

The best way to represent the earth is by means of a globe.

Astrology is the art of predicting the future by observing the positions of the stars.

The stars exert an influence on human affairs.

The positions of the planets at the time of birth determine a person's character and destiny.

Astrology is a science, but it is also an art.

The influence of the stars is not absolute, but it is powerful.

The study of optics is concerned with the nature of light and vision.

Light travels in straight lines.

The angle of incidence is equal to the angle of reflection.

Refraction is the bending of light as it passes from one medium to another.

The eye sees by means of rays that emanate from it.

Music is the art of combining sounds in a pleasing way.

The intervals between musical notes can be expressed as ratios of whole numbers.

Consonance and dissonance are determined by the mathematical relationships between notes.

The study of harmonics is closely related to the study of astronomy.

The universe is a harmonious whole, and music is a reflection of that harmony.

I know that I am mortal by nature, and ephemeral; but when I trace at my pleasure the windings to and fro of the heavenly bodies, I no longer touch the earth with my feet: I stand with Zeus himself and take my fill of ambrosia.

The best way to learn is to teach.

The heavens are a sphere, and move as a sphere.