Extra: Mercury retrograde also squares (hard aspect) Chiron on December 10th, an asteroid dubbed the wounded healer who represents our greatest wounds and how we can heal and grow. Chiron ends his own retrograde December 5th square Mercury retrograde, so we may be focused on what we need to heal from, re-open an old wound, feel extra sensitive, and need to be careful with our words and rhetoric.
The retrograde begins at 29 degrees Sagittarius, so those of you Sagittarians born after December 18th can feel the start of this retrograde most. The retrograde ends at 13 degrees Sagittarius, so those of your Sagittarians born December 2nd – 8th can feel the end of the retrograde most.
For the rest of you, check the house(s) Mercury will be retrograding in of your own natal chart, and any aspects Mercury will make during its retrograde to your natal planets, to fully understand how it will impact you personally.
If you have Mercury retrograde in your natal or progressed chart, you may not feel the worst of this. Those individuals generally don’t experience the difficulties of the retrograde because it feels more natural to them.
Of course, chances are everyone else around them doesn’t have the same aspect, so they can still experience difficulties brought on by others.
Source: The Dark Pixie Astrology