Pytheas

Pytheas of Massalia (ˈpɪθiəs; Ancient Greek: Πυθέας ὁ Μασσαλιώτης Pythéas ho Massaliōtēs; Latin: Pytheas Massiliensis; born 350 BC, 320–306 BC) was a Greek geographer, explorer and astronomer from the Greek colony of Massalia (modern-day Marseille, France). He made a voyage of exploration to northwestern Europe in about 325 BC, but his account of it, known widely in antiquity, has not survived and is now known only through the writings of others. On this voyage, he circumnavigated and visited a considerable part of modern-day Great Britain and Ireland. He was the first known scientific visitor to see and describe the Arctic, polar ice, and the Celtic and Germanic tribes. He is also the first person on record to describe the midnight sun. The theoretical existence of some Northern phenomena that he described, such as a frigid zone, and temperate zones where the nights are very short in summer and the sun does not set at the summer solstice, was already known. Similarly, reports of a country of perpetual snow and darkness (the country of the Hyperboreans) had reached the Mediterranean some centuries before. Pytheas introduced the idea of distant Thule to the geographic imagination, and his account of the tides is the earliest one known that suggests the moon as their cause. Much of what is known about Pytheas comes from commentary written by historians during the classical period hundreds of years after Pytheas's journeys occurred. Pliny said that Timaeus (born about 350 BC) believed Pytheas' story of the discovery of amber. First century BC Strabo said that Dicaearchus (died about 285 BC) did not trust the stories of Pytheas. That is all the information that survives concerning the date of Pytheas' voyage. Henry Fanshawe Tozer wrote that Pytheas' voyage was about 330 BC, derived from three main sources. Pytheas described his travels in a work that has not survived; only excerpts remain, quoted or paraphrased by later authors, most familiarly in Strabo's Geographica, Pliny's Natural History and passages in Diodorus of Sicily's history.