(Thank you to my friend ladytealfor the info.)
Mercury, the planet of communication, goes retrograde -- for the last time this year -- in the sign of Libra on September 24, until it turns direct again on October 15. Mercury typically turns retrograde three times a year, but the effects of each period differ depending on the sign in which it happens.
Mercury rules thinking and perception, processing and disseminating information and all means of communication, commerce, education and transportation. Mercury retrograde periods gives rise to personal misunderstandings, as well as flawed, disrupted, or delayed communications, negotiations and trade glitches and breakdowns with phones, computers, cars, buses and trains.
This retrograde, like any cosmic event, affects each of us differently depending on how it's positioned in our personal birth charts. A Mercury retrograde period may be very prosperous for those who have retrograde Mercury, or a well-aspected Mercury in their birth charts.
While a retrograde period may be an introspective time for all of us, if Libra is prominent in your chart, you will have more than your usual share of introspection. If other Cardinal signs like Aries, Cancer or Capricorn are prominent in your chart, you will also experience a period of intense self-examination.
Mercury retrograde in Libra can disturb mental balance, making you more indecisive than usual. In addition, attempts to maintain objectivity and an unbiased approach are likely to be difficult and can colored with emotion. Jealousy and possessiveness may enter relationships. Sharing ideas, especially those connected with moneymaking and other tangible rewards may present a higher risk. Gossip about public figures may run rampant and should be taken with a grain of salt. All areas of communication, especially matters related to law, partnerships and marriage, may also be affected.