Andronicus of cyrrhus biography of abraham

Timocharis of Alexandria (Greek: Τιμόχαρις or Τιμοχάρης, gen. Τιμοχάρους; c. 320–260 BC) was a Greek astronomer and philosopher. Likely born in Alexandria, he was a contemporary of Euclid.

Work

What little is known about Timocharis comes from citations by Ptolemy in the Almagest.

These indicate that Timocharis worked in Alexandria during the 290s and 280s BC. Ptolemy lists the declination of 18 stars as recorded by Timocharis or Aristillus in roughly the year 290 BC.[1] Between 295 and 272 BC, Timocharis recorded four lunar occultations and the passage of the planet Venus across a star.[2] These were recorded using both the Egyptian and Athenian calendars.[3] The observed stellar passage by Venus may have occurred on October 12, 272 BC when the planet came within 15 arcminutes of the star η Virginis.[4]

The observations by Timocharis are among the oldest Greek records that can be assigned a specific date.

They are only exceeded by records of the summer solstice of 432 BC, a