Euctemon ( el, Εὐκτήμων, ''gen.'' Εὐκτήμωνος; fl. 432 BC) was an

Athenian Athens ( ; el, Αθήνα, Athína ; grc, Ἀθῆναι, Athênai (pl.) ) is both the capital and largest city of Greece. With a population close to four million, it is also the seventh largest city in the European Union. Athens dominates ...

astronomer An astronomer is a scientist in the field of astronomy who focuses their studies on a specific question or field outside the scope of Earth. They observe astronomical objects such as stars, planets, moons, comets and galaxies – in either ...

. He was a contemporary of

Meton Meton of Athens ( el, Μέτων ὁ Ἀθηναῖος; ''gen''.: Μέτωνος) was a Ancient Greece, Greek mathematician, astronomer, list of geometers, geometer, and engineer who lived in Athens in the 5th century BC. He is best known for ...

and worked closely with this astronomer. Little is known of his work apart from his partnership with Meton and what is mentioned by

Ptolemy Claudius Ptolemy (; grc-gre, Πτολεμαῖος, ; la, Claudius Ptolemaeus; AD) was a mathematician, astronomer, astrologer, geographer, and music theorist, who wrote about a dozen scientific treatises, three of which were of importance ...

. With Meton, he made a series of observations of the

solstice A solstice is an event that occurs when the Sun appears to reach its most northerly or southerly excursion relative to the celestial equator on the celestial sphere. Two solstices occur annually, around June 21 and December 21. In many countr ...

s (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 Geminus of Rhodes ( el, Γεμῖνος ὁ Ῥόδιος), was a Greek astronomer and mathematician, who flourished in the 1st century BC. An astronomy work of his, the ''Introduction to the Phenomena'', still survives; it was intended as an int ...

and Ptolemy quote him as a source on the rising and setting of the stars.

Pausanias Pausanias ( el, Παυσανίας) may refer to: *Pausanias of Athens, lover of the poet Agathon and a character in Plato's ''Symposium'' *Pausanias the Regent, Spartan general and regent of the 5th century BC * Pausanias of Sicily, physician of t ...

's ''Description of Greece'' names Damon and Philogenes and Euctemon's children. The

lunar crater Lunar craters are impact craters on Earth's Moon. The Moon's surface has many craters, all of which were formed by impacts. The International Astronomical Union currently recognizes 9,137 craters, of which 1,675 have been dated. History The wor ...

Euctemon is named after him.

References

External links

Imago Mundi: Euctemon
5th-century BC Athenians Ancient Greek astronomers Year of birth unknown Year of death unknown {{sci-hist-stub