← Encyclopedia of Astrology · lesson 35/235
Neptune
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Neptune is the planet of the boundless: imagination, inspiration, compassion, spirituality and longing, and also confusion, illusion and escape. It describes where the edges of things blur — where a person is most open to beauty and to others' suffering, and where they are most likely to idealise, be deceived or drift. Modern astrologers give it artists, mystics, healers, the sea, film and music, and anything that cannot be held in the hand.
Nature
Neptune was discovered in 1846, found where mathematicians had predicted from irregularities in the orbit of Uranus. Having no place in the tradition, it has no traditional nature; modern astrologers generally describe it as cold and moist, feminine in temper, and neither benefic nor malefic — refined and inspiring at its best, evasive and undermining at its worst. It belongs to no sect.
Signs it rules and where it is strong or weak
Modern astrology gives Neptune the rulership of Pisces, which Jupiter ruled in the tradition and still co-rules in many modern charts. Its detriment is therefore Virgo. Its exaltation is disputed: Cancer, Leo and Aquarius have all been proposed, and many astrologers assign none. None of this belongs to the traditional dignity scheme.
Motion
Neptune takes about 165 years to go round the Sun and spends roughly fourteen years in each sign. It is retrograde for five to six months every year. Its sign is shared by everyone born over more than a decade, so it is read as a generational theme — the shared dreams and disillusionments of an age — while its house and close aspects bring it into a personal chart.
In a chart
Neptune by house points to where a person tends to seek something ideal and is most open to inspiration and to illusion: in the 7th, a partner idealised or rescued; in the 10th, a vocation in the arts or in care, or a career whose direction is slow to clear; in the 2nd, a loose hold on money; in the 12th, a strong inner and spiritual life. Close to the Sun, Moon or Venus, it inclines toward sensitivity and imagination.
In transit
A transiting Neptune can stay near a natal point for two years or more. Its contacts are often read as times when certainties soften: a loss of direction, a gain in compassion or creativity, and a need to check facts and agreements more carefully than usual. They tend to favour art, retreat and spiritual practice over hard decisions.