Between Earth and the sun Mercury passes on May 9

TRANSIT OF MERCURY: On Monday morning, May 9th, Mercury will pass directly between Earth and the sun, producing a rare transit visible from the Americas, Europe, Africa and parts of Asia.  

Tomorrow, May 9th, the planet Mercury will pass in front of the sun, producing an inky-black spot on the solar disk. You may catch it live on the Internet, courtesy of the Coca-Cola Space Science Center in Columbus, Georgia. - Space Weather

CHANCE OF STORMS: NOAA forecasters say there is a 65% chance of G1-class geomagnetic storms on May 9th when Earth enters a solar wind stream filled with negative-polarity magnetic fields. A display of high-latitude auroras is possible, especially in the southern hemisphere where visibility is improved by darkening autumn skies.

Early Roman bronze statuette of Mercury, found near Huis, France (British Museum)

Mercury (mythology). From Wikipedia

Mercury (/ˈmɜːrkjᵿri/; Latin: Mercurius [mɛrˈkʊr.jʊs] About this sound listen (help·info)) is a major Roman god, being one of the Dii Consentes within the ancient Roman pantheon. He is the patron god of financial gain, commerce, eloquence (and thus poetry), messages/communication (including divination), travelers, boundaries, luck, trickery and thieves; he is also the guide of souls to the underworld.