Euctemon ( Εὐκτήμων to 430 BC) was an ancient Greek astronomer, geographer, meteorologist and from Athens.
He was, together with the first Greek astronomer Meton to, of which observation records are maintained. This includes the observation of the summer solstice of the year 432 BC, what Ptolemy records. Geminus writes the application of the nineteen - year period (Greek: Enneakaidekaeteris or Enneadecaeteris ) astronomers to Euctemon to. This is the Metonic cycle, which was later named after his contemporaries. Euctemon watching the sunrises and sunsets of fixed stars, in Athens, the Cyclades, in Macedonia and Thrace, as Ptolemy records.
As a work of a meteorologist is considered to be - positioned together with Meton of Athens Parapegma, an engraved in wood or stone " perpetual " calendar, which contained, besides astronomical and weather information for each day of the year.
Euctemon also worked as a geographer, where he provided information on the Strait of Gibraltar.
After Euctemon a lunar crater is named.
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