Great Comet of 371 BC

[5][6] The comet was reported to have had a long, bright tail that had a reddish colour, as well as a nucleus brighter than any star in the night sky.

[3] Aristotle wrote in Book 1 of Meteorologica[7] The great comet, which appeared about the time of the earthquake in Achaea and the tidal wave, rose in the west...

Quoting a lost source, Diodorus Siculus wrote that[1] [T]here was seen in the heavens during the course of many nights a great blazing torch which was named from its shape a flaming beam...this torch had such brilliancy...and its light such strength that it cast shadows on the earth similar to those cast by the moon.Diodorus wrote that the comet was believed by some to have foretold the decline of the Spartans, and describes the debate over its nature.

[9] In that fire there were many worthy things which should be noted, but nothing more so the fact that when it flashed in the sky the sea immediately covered Buris and Helice.Most sources refer to it as occurring in 372-371 BC.

[10] Based on the ancient Greek belief that comets were the source of celestial objects, Seneca challenged the report of Euphorus.