Which coincide with the mean sea level surface is the geoid.
其中与平均海平面重合的面就是大地水准面。
Mean sea level is an equipotential surface with respect to gravity.
平均海平面就是一个关于重力的等位面。
Height: the altitude of your observing site above the mean sea-level, in meters.
海拔：你的观测地点的海拔高度，单位是米。
Height: the altitude of your observing site above the mean sea-level, in meters.
海拔：你的观测地点的海拔高度，单位是米。
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