Early Greek Philosophy and the Pre-Socratic Schools (c. 600–480 BCE)

1. Thales proposes water as first principle

   Jan 1, 600 BCELabels: Thales of

   • Britannica
   • IEP

2. Thales and the eclipse tradition (Halys)

   May 28, 585 BCELabels: Thales of, Halys eclipse

   • IEP
   • Eclipse Thales

3. Anaximander introduces the apeiron principle

   Jan 1, 560 BCELabels: Anaximander

   • Britannica
   • IEP

4. Anaximander credited with early world map

   Jan 1, 550 BCELabels: Anaximander, world map

   • Britannica
   • Britannica

5. Anaximenes develops air-based cosmology

   Jan 1, 545 BCELabels: Anaximenes

   • Britannica

6. Pythagoras settles in Croton (Magna Graecia)

   Jan 1, 525 BCELabels: Pythagoras, Croton

   • Britannica
   • Britannica

7. Xenophanes critiques anthropomorphic theology

   Jan 1, 520 BCELabels: Xenophanes

   • Britannica
   • IEP

8. Heraclitus active in Ephesus

   Jan 1, 500 BCELabels: Heraclitus, Ephesus

   • SEP
   • Britannica

9. Hecataeus argues against Ionian Revolt

   Jan 1, 500 BCELabels: Hecataeus of

   • Britannica

10. Hecataeus composes Periodos gēs geography

    Jan 1, 490 BCELabels: Hecataeus, Periodos g

    • Britannica
    • Wikipedia

11. Parmenides composes metaphysical poem

    Jan 1, 480 BCELabels: Parmenides, On Nature

    • SEP

12. Early Presocratic arc reaches new phase

    Jan 1, 480 BCELabels: Presocratic synthesis

    • SEP
    • SEP