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- Anaximander : (fl. early 6th c. BC) A Greek philosopher who held that the primary principal of the world consisted of a boundless, non-material entity which underlay the world and its various changes.
- Atheism : Absence of belief in any god or other supernatural beings; distinct from antitheism, or opposition to religion, and agnosticism, the position that one cannot know whether such beings exist.
- Atomic hypothesis : Article describing the atomic hypothesis and its historical development and significance
- Epicurus : Ancient Greek philosopher who founded epicureanism.
- Milky Way : The Milky Way galaxy which contains our solar system.
- Positivist calendar : Alternative calendar proposed by Auguste Comte in 1849, with each day and month celebrating a different person.
- Pythagoras : Greek mathematician and thinker of the 6th century BCE.
- Thales : (fl. 6th century B.C.) Greek philosopoher sometimes considered the founder of modern philosophy and astronomy; important chiefly because he sought for a natural explanation of phenomena rather than a mythical or religious explanation.