Mercury is the Sun's closest companion. It is difficult to see because it is often outshone by the Sun during both day and night. Mercury represents the way your mind works, your thought patterns, things that interest you and how you approach them, and your attitude to acquiring information generally.

Mercury rules advertising, air travel, authors, bargaining, books, clerks, clothing, computers, editors, history, hygiene, intellect, lectures, logic, messages, nerves, post, respiration, signals, talking, telephones, Wednesdays, wit, writing and youth.

Mercury rules the signs of Gemini and Virgo.