The moon sign shapes your emotions and your soul, coloring the subconscious stuff going on below the surface: your deepest needs and what helps you feel emotionally secure. So, to fully understand your feelings and where they're coming from, it’s crucial to know where your moon sign is in your astrological chart or, in other words, where the moon was when you were born.
Your moon sign can also influence how strongly your sun sign (or rising sign) is expressed. For example, if you’re a fiery Aries with a mellow Taurus moon, your aggressive nature may be toned down by the steady Taurus influence. Or, if you’re a secretive Scorpio with an ethereal Pisces moon, you could be extra intuitive and sensitive since these are the traits of these two water signs.