the moon sign is very important as it relates to emotional self and represents needs. if a mans moon was in libra also there would be a flow of energy and attraction also if a mans sun sign was same as your moon sign it would feel good for you.if both moons are in harmony domestic life would be happy and harmonius.just like any relationship or love affair there are many factors at play.harmony between sun signs getting back to your original question reflects the connection on the soul level.for libra sun sign generally the other air signs as you stated and also fire signs are harmonius.earth and water less so.
Thanks Malian Here you are talking about the elements and their harmonious or malific influence on each other. This seems to be in conjugal or romantic settings. i have had a friend for decades who has a Libra Moon while i have a Cancer Sun. The relationship still is there. We are friends. The interesting thing is that we have a very strong square between these planets. Sometime i think that souls who have evolved to higher levels can look beyond ego conflicts and absorb the very differences that exist between themselves. There are also times that the tension involved increases the ability to learn from one another. Although i will admit to feeling the presence of this square and its tension.
Steve Hydonus