As far as love compatibility is concerned, this combination is traditionally considered to be rather exciting! When two people are born under opposite Sun Signs, such as Aries and Libra, there's often a strong attraction between them because they're magnetically drawn to qualities and traits in each other which perfectly complement their own.
Each has the ability to compensate for the other's weak points: here Aries' independence and decisiveness ideally balance Libra's tendency to lack a little in self-reliance and to over-procrastinate at times. At the same time, Aries' toughness – and habit of charging in madly where angels fear to tread – are nicely offset by Libra's gentler, and far more measured and conciliatory approach.
Problems arise only if one person tries to convert the other to their own particular way of doing things, in which case the differences between them can become a major hindrance rather than an asset.
In a long-term relationship, to avoid an ongoing battle of wills, Libra has to accept it's unlikely ever to be successful in taming the Ram's daredevil spirit, while impatient Aries eventually has come to terms with Libra's sit-on-the-fence approach.
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This was requested by @jessitopor :)