升交點黃經
升交點經度（longitude of ascending node，符號係☊ 或者 Ω）係用嚟具體描述天體喺空間入面軌道嘅軌道要素之一。佢係由參考方向（經度原點）開始計，喺參考平面上量度去昇交點嘅角度。
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