The shape and perigee of artificial satellite orbits shall continually variate due to caused by the atmospherical drag and the earth gravity.

人造地球卫星的轨道由于大气阻力和地球引力场等因素的摄动，其形状和近地点位置将不断改变。

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This paper deals with the characteristic, the USES and the calculation of orbits of earth synchronous satellite.

本文阐述了地球同步卫星的特征、用途及其轨道计算。

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This paper presents a new method to classify satellite orbits and the basic Characterization of stay orbit.

本文给出卫星轨道分类的一个新方法和逗留轨道的基本特性，这一特性可用于卫星轨道的初步设计。

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Satellite and space expert Dr Stuart Eves stressed the large uncertainties involved in tracking the "decay" of satellite orbits (their slow fall back into the Earth's atmosphere).

BBC: Nasa refines satellite crash time

Europa, a satellite of Jupiter, and Enceladus, which orbits Saturn, both have large volumes of liquid water buried beneath their icy crusts.

BBC: Drill reaches Antarctica's under-ice Lake Whillans

For 145 years, ITU has coordinated the shared global use of the radio spectrum, promoted international cooperation in assigning satellite orbits, worked to improve telecommunication infrastructure in the developing world, established the worldwide standards that foster seamless interconnection of a vast range of communications systems and addressed the global challenges of our times, such as mitigating the impact of natural disasters and climate change and strengthening cybersecurity.

UNESCO: Post-Conflict and Post-Disaster Responses