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Euctemon
Ancient Greek astronomer · Scientists · Died 432 BC
Euctemon was an Athenian astronomer. He was a contemporary and collaborator of Meton, who developed the 19-year Metonic cycle, which synchronises 235 lunar months with 19 solar years to form the basis of ancient Greek calendrical systems.
Euctemon is read about 5 times a day, in 14 languages.
A typical day, 30 days to 11 October 2026
The middle day of the days counted, so one week of news cannot move it. The line under it is the last 120 days, one point a day.
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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. Geminus and Ptolemy quote him as a source on the rising and setting of the stars. Pausanias's Description of Greece names Damon and Philogenes as the children of Euctemon.