Word origin · etymology
Roman mythological name.
The planet is named for Neptune, the Roman sea god.
How we know · epistemology
Observed body and symbolic association
Neptune's distant orbit gives it slow apparent zodiacal motion shared by many birth cohorts. Interpretations involving imagination or uncertainty come from modern astrology; a placement alone cannot establish an individual's psychological state.
NASA: Solar System planets ↗Astrology.com: Planets (first-party symbolic meanings) ↗
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