Astronomy
Horoscopes setting out the positions of the planets at the time of an individual's birth are available in Chaldea.
MathematicsA follower of Pythagoras, probably before this time, discovers that some lengths cannot be measured with the same unit used to measure other lengths; for example, the diagonal of a square is incommensurable with its sides.
TransportationCarthaginians begin to build quadriremes, ships with four banks of rowers, for their navy with the intention of invading Syracuse. Diodorus Siculus, however, says that workers hired by Dionysius the Elder of Syracuse [b. Syracuse, c. 430 bce, d. 367 bce] were the "first to think of construction of such ships" in 399 bce. See also 399 bce Transportation.
This decade witnessed the continuing decline of the Achaemenid Empire, fierce warfare amongst the Greek city-states during the Peloponnesian War, the ongoing Warring States Period in Zhou dynasty China, and the closing years of the Olmec civilization (lasting from c. 1200–400 BC) in modern-day Mexico.
| Millennium: | 1st millennium BC |
| Centuries: | 6th century BC – 5th century BC – 4th century BC |
| Decades: | 440s BC 430s BC 420s BC – 410s BC – 400s BC 390s BC 380s BC |
| Years: | 419 BC 418 BC 417 BC 416 BC 415 BC 414 BC 413 BC 412 BC 411 BC 410 BC |
| Categories: | Births – Deaths – Architecture Establishments – Disestablishments |
Contents: 419 BC 418 BC 417 BC 416 BC 415 BC 414 BC 413 BC 412 BC 411 BC 410 BC
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