Retrograde Mercury square Uranus...

starts on December 20 (using a 1 degree orb), is exact on December 21 at 10.30am in Kilmore, leaves on December 22.  Retrograde Mercury at 26 degrees and 46 minutes of Sagittarius, Uranus at 26 degrees and 46 minutes of Pisces.

Since Mercury is retrograde, this aspect is a repeat of the same one that happened on November 28, the only difference being that Mercury is retrograde this time around, while Uranus is now direct.  The aspect actually falls in the same degree as last time.  Read the post here.