History of the Peloponnesian War

Thucydides

Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.

During the same summer at the beginning of a lunar month[*](August 3rd, 431 B.C.)(the only time, it seems, when such an occurrence is possible) the sun was eclipsed after midday; it assumed the shape of a crescent and became full again, and during the eclipse some stars became visible.