Mercury: a planet, an element, a day of the week, and a messenger of the gods

"The Babylonians identified Mercury with Nabu and the Egyptians with Thoth, their deities associated with writing and who sometimes acted as the messenger of the gods. That was also the role of the ancient Greek Hermes and his Roman equivalent Mercury, though it took the Greeks a while to realise that morning and evening apparitions of Mercury were the same object."

Mercury (on the left) compared with Earth (on the right). Photo by NASA

""To the imperial Romans, Wednesday was dies Mercurii (Mercury's day) and many languages descended from Latin preserve the name Mercury for the corresponding day in various forms: mercredi, mercoledi, miércoles, miercuri (French, Italian, Spanish, Romanian) and even Dydd Mercher (Welsh). The Norse/Germanic personification of Mercury was Odin/Wotan, from which English derives Wednesday (Woden's day), Dutch woensdag, and Danish, Norwegian and Swedish Onsdag."

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