Meridian相关的词根或词缀是: di

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Of or relating to meridians or a meridian .

子午线的子午线的或与子午线有关的。

The meridian was a very understandable derivative from what was probably the most ancient astronomical instrument of all , the gnomon , used for measuring the different lengths of the sun 's shadow .

我们很容易理解子午线是从圭表衍生出来的，圭表是中国古代用来度量日影长度的天文仪器，很可能是所有天文仪器中最古老的。

Looking south , the observer measured the shadow at noon ; looking north during the night , he measured the times at which the various circumpolar made their upper and lower transits across the meridian .

向南看，观测者可以测量中午的日影；夜间向北看，观测者可以测出不同拱极星通过上半子午线和下半子午线的次数。

Their astronomical system was thus closely associated with the concept of the meridian ( the great circle of the celestial sphere passing through the pole star and the observer 's zenith ) , and they determined systematically the culminations and lower transits ( meridian passages ) of these circumpolar stars .

因此，他们的天文学体系与子午线（天球绕过北极星和观测者的天顶产生的大圆弧）的概念有密切联系，系统化地决定了拱极星的中天和下中天（中天）。

Meridian circulation is closely related to life . Life would end , if meridian circulation stops .

经络循行是与生命共存的：经络循行停止，生命则终结。