(2004) on Earth orbital variations, including eccentricity, over the last 50 million years and for the coming 20 million years The orbital simulations by
orbit),则其高度约为20200公里。 中地球轨道 地心轨道 NASA Technical Standard 8719.14 (draft). NASA Orbital Debris Program Office. 8 Aug 2006. (原始内容 (PDF)存档于2006-08-23). Catalog