In astrology, the Moon represents emotions and the domestic life, while Jupiter represents optimism, abundance, and good luck.
When your Moon makes a harmonious aspect (conjunction, trine, sextile) to another person’s Jupiter, good will and harmony permeate within your relationship. You truly want to make each other happy and help one another. You tend to give one another the benefit of the doubt, and tend to be very kind to one another. You tend to have similar religious values, which goes a long way in maintaining a long-term relationship. This aspect indicates mutual trust and understanding of each other’s needs, as well as mutual generosity. The Jupiter person expands the Moon person’s emotions in a pleasant way, which is especially powerful if the Moon person is usually shy or reserved when it comes to emotional expression. The best part of this aspect is that you are able to make your partner laugh!
The hard aspects (square, opposition) between the Moon and Jupiter in synastry are more difficult to handle. This aspect often indicates that feelings may get blown out of proportion, which can lead to hurt feelings and arguments. You may tend to over-indulge one another, which can lead to unfulfilled expectations based on lofty promises. There may be philosophical differences, and there may be conflict over extravagance. The Moon person may feel the Jupiter person is overly polite or superficial, while the Jupiter person may feel the Moon person is overly-emotional or touchy.