Mercury retrograde: Mercury is the toasty planet whirling so close to the Sun that it never appears farther than one sign away. Mercury has 4.15 years, or rotations around the Sun, to each earth year. Because we’re moving in the same direction, although slower, Mercury appears to rotate around the Sun only three times a year; it can move up to 28° ahead of the Sun as an evening star, then starts to circle back on its orbit and looks, from our Earthly perspective, to move backwards or turn retrograde against the pattern of the Zodiac behind it for about three weeks. (see http://astro.unl.edu/classaction/animations/renaissance/retrograde.html )
When it does, we get a chance to come to a new and deeper understanding, reconnect with our past and bring work to completion, do anything that begins re-, like remember, re-edit, reconnect, retreat, reorganize, but all that Mercury stands for may not work quite like we hope. Mercury retrograde can really snafu business as usual, but it is loaded with its own gifts if we take the time and dance with it well.
Mercury likes to move, so the day at the beginning and end of this retrograde cycle -when Mercury appears to hold still -are the trickiest; so much hold still here on earth. Mercury disappears into the Sun’s light and reappears on the other side more often than any other visible planet—one reason it corresponds to the magician and the shape-shifter archetypes in mythology.
Mercury: In Greek mythology, Mercury was the God of the crossroads, the messenger of the Gods and the psychopomp that went down to the underworld to negotiate for the release of lost souls. He was also God of thieves; he symbolizes an ingenious quality that is a gift when in the service of the Gods but a source of trouble when used to disconnect us from heart and body or for personal gain.