Euctemon (Greek:Εὐκτήμων,gen. Εὐκτήμωνος; fl. 432 BC) was anAthenianastronomer. He was a contemporary ofMeton and worked closely with this astronomer. Little is known of his work apart from his partnership with Meton and what is mentioned byPtolemy. With Meton, he made a series of observations of thesolstices (the points at which the Sun is seen at the greatest distance from the equator) in order to determine the length of the tropical year.Geminus and Ptolemy quote him as a source on the rising and setting of the stars.Pausanias'sDescription of Greece names Damon and Philogenes as Euctemon's children.^[1][2]

Thelunar craterEuctemon is named after him.

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