Neptune

1. N the Roman god of the sea (古罗马神话中的)海神尼普顿 (Greek counterpart Poseidon)

N

1. N the eighth planet from the sun, having eight satellites, the largest being Triton and Nereid, and a faint planar system of rings or ring fragments. Mean distance from sun: 4497 million km; period of revolution around sun: 164.8 years; period of rotation: 14 to 16 hours; diameter and mass: 4.0 and 17.2 times that of earth respectively 海王星