Sagittarius, in relation to Aries, is considered favorable. Both are fire signs, and here we have a combination of Jupiter for Sagittarius and Mars for Aries. Together, this produces expansion, much activity, a reaching out for more, a lack of satisfaction with the status quo. You seldom do things halfway when you are involved with a Sagittarian. For you, Aries, this association could result in long journeys, including journeys of the mind.
On the negative side, there could be plans too big to be practical. There could be delays. Generally Aries, this is a favorable sign for you. Your sense of humor improves with Sagittarius. You enjoy travel in the company of Sagittarius. These natives help you expand horizons and are an excellent influence if you desire to write, advertise or publish.