When two planets are 120 degrees apart, they are in trine. This aspect is considered harmonious and can indicate ease and flow in the areas of life ruled by the planets involved.

This aspect can occur with elements of the same element (fire, earth, air, water).

Sun trine Moon can create emotional harmony and balance between your conscious and unconscious self without much effort.

Mars trine Venus can create passion and desire in towards your relationships without much effort.