This short book intends to suggest to the Reader a practical method to evaluate, making some comparisons, the potentialities of a synastry: as regards love, business, studies and other. This method is based first of all on the teachings of Tradition and after on the contributions that comparative studies have offered to our discipline, for example the statistical study of Carl Gustav Jung and of the Nobel Prize for Physics Wolfgang Pauli about the excellence of the conjunction Sun-Moon in a couple. Personally, for many years I studied also the mid-points between the skies of two subjects, but I did not get valid results. As in all books of mine you will find some or many practical examples and most of all the way to test what I suggest on your personal examples: try this method on yourselves, on your past experiences, on the couples that you know very well and that you have known for a long time. If this system convinces you, use it. Otherwise throw the book away. If I may praise shortly this book, I'd like to add that probably it is the first example, or one of the first examples, of collaboration between an astrologer that practises the Judicial Astrology (or Predictive Astrology or Astrologia Gallica of Morin de Villefranche and of Andre Barbault) and the Astrology of an expert colleague, Danila Madau Perra, who teaches Yoga and is Buddhist, but who accepts, approves of and also practices Aimed Solar Returns. In short: a true example of an attempt to study Astrology in a holistic way."