Mercury the planet of communication goes retrograde from September 18 2015 to 10 October 2015.  Whenever a planet goes retrograde it does the reverse affects of what it does when it is going direct.  Mercury goes retrograde three times a year.  By rule this is not a good time to sign any important documents, make any important decisions and start anything brand new.  There are definitely exceptions to the rule depending on the circumstance. As Mercury is the planet that helps us communicate our thoughts and deliver our communication whether in person or using technology, when it is retrograde it makes us internalize our thoughts and makes us very introspective over this period.  Mercury takes you back over old thought patterns that you may have glossed over and now have to take a deeper look into things (possibly need to address an issue you never got around to).  It also will make communication more confusing as there will be misunderstandings as we are not as clear with our communication. Around mercury retrogrades you can expect to be delayed when trying to get some where fast, miss appointments by getting the days/times mixed up, and technical break downs with technology and cars.   To know where Mercury is dragging you back to ponder over more, look to the house in your Natal chart ruled by Libra.  For the collective this Mercury retrograde is asking us to review our relationships - is there balance?  This applies to all of our friendships and personal relationships.