Neptune's influence on the mind is to inspire fantasy and imagination, hopes and aspirations, although it can also induce vagueness and confusion. Neptune's influence on the spirit could be deceptive, leading one toward mysticism, and possibly away from a true spirituality. Neptune's influence on Power is negative, increasing the individual's vulnerability to the power of others. Neptune's influence on Passion is to confuse, making it difficult for an individual to know what they are feeling.

Neptune was not discovered until the nineteenth century and is thus a relative newcomer. Astrologers today usually agree that nothing has been proved about this planet's influence. Starscine has reduced its level of influence in the calculation of readings accordingly.

Its astrological influences are thought to include impressionability, visions, fantasy and imagination, inclination to mysticism and eccentricity; vagueness; confusion; deception. It is associated with Pisces, although some astrologers believe this is more because of name association (fish and sea god) than astrological influence.

More information on how Neptune influences the different starsigns

Starscine uses the Inverse Square of the distance between the Earth and Neptune to calculate the relative astrological influence of Neptune.