---
title: "Natural philosophy"
chunk: 3/5
source: "https://en.wikipedia.org/wiki/Natural_philosophy"
category: "reference"
tags: "science, encyclopedia"
date_saved: "2026-05-05T03:12:08.564857+00:00"
instance: "kb-cron"
---

=== In ancient Greece ===
Early Greek philosophers studied motion and the cosmos. Figures like Hesiod regarded the natural world as offspring of the gods, whereas others like Leucippus and Democritus regarded the world as lifeless atoms in a vortex. Anaximander deduced that eclipses happen because of apertures in rings of celestial fire. Heraclitus believed that the heavenly bodies were made of fire that were contained within bowls. He thought that eclipses happen when the bowl turned away from the earth. Anaximenes is believed to have stated that an underlying element was air, and by manipulating air someone could change its thickness to create fire, water, dirt, and stones. Empedocles identified the elements that make up the world, which he termed the roots of all things, as fire, air, earth, and water. Parmenides argued that all change is a logical impossibility. He gives the example that nothing can go from nonexistence to existence. Plato argues that the world is an imperfect replica of an idea that a divine craftsman once held. He also believed that the only way to truly know something was through reason and logic. Not the study of the object itself, but that changeable matter is a viable course of study.

=== Aristotle's philosophy of nature ===

"An acorn is potentially, but not actually, an oak tree. In becoming an oak tree, it becomes actually what it originally was only potentially. This change thus involves passage from potentiality to actuality — not from non-being to being but from one kind or degree to being another"
Aristotle held many important beliefs that started a convergence of thought for natural philosophy. Aristotle believed that attributes of objects belong to the objects themselves, and share traits with other objects that fit them into a category. He uses the example of dogs to press this point. An individual dog may have very specific attributes (ex. one dog can be black and another brown) but also very general ones that classify it as a dog (ex. four-legged). This philosophy can be applied to many other objects as well. This idea is different from that of Plato, with whom Aristotle had a direct association. Aristotle argued that objects have properties "form" and something that is not part of its properties "matter" that defines the object. The form cannot be separated from the matter. Given the example that you can not separate properties and matter since this is impossible, you cannot collect properties in a pile and matter in another.
Aristotle believed that change was a natural occurrence. He used his philosophy of form and matter to argue that when something changes you change its properties without changing its matter. This change occurs by replacing certain properties with other properties. Since this change is always an intentional alteration whether by forced means or by natural ones, change is a controllable order of qualities. He argues that this happens through three categories of being: non-being, potential being, and actual being. Through these three states the process of changing an object never truly destroys an object's forms during this transition state but rather just blurs the reality between the two states. An example of this could be changing an object from red to blue with a transitional purple phase.

=== Medieval philosophy of motion ===
Medieval thoughts on motion involved much of Aristotle's works Physics and Metaphysics. The issue that medieval philosophers had with motion was the inconsistency found between book 3 of Physics and book 5 of Metaphysics. Aristotle claimed in book 3 of Physics that motion can be categorized by substance, quantity, quality, and place. where in book 5 of Metaphysics he stated that motion is a magnitude of quantity. This disputation led to some important questions to natural philosophers: Which category/categories does motion fit into? Is motion the same thing as a terminus? Is motion separate from real things? These questions asked by medieval philosophers tried to classify motion.
William of Ockham gives a good concept of motion for many people in the Middle Ages. There is an issue with the vocabulary behind motion that makes people think that there is a correlation between nouns and the qualities that make nouns. Ockham states that this distinction is what will allow people to understand motion, that motion is a property of mobiles, locations, and forms and that is all that is required to define what motion is. A famous example of this is Occam's razor, which simplifies vague statements by cutting them into more descriptive examples. "Every motion derives from an agent." becomes "each thing that is moved, is moved by an agent" this makes motion a more personal quality referring to individual objects that are moved.