Euctemon (fl. 432 BC) was an Athenian astronomer. He was a contemporary of Meton and worked closely with this astronomer. Little is known of his work apart from his partnership with Meton and what is mentioned by Ptolemy. With Meton, he made a series of observations of the solstices (the points at which the sun is at greatest distance from the equ...
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http://en.wikipedia.org/wiki/Euctemon
(from the article `calendar`) ...a religious lunar calendar and the tropical year was the Metonic cycle. This was first devised about 432 by the astronomer Meton of Athens. Meton ...
Found on
http://www.britannica.com/eb/a-z/e/50
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