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。
Each month, the Moon passes through perigee (the point closest to Earth) and apogee (the point farthest from Earth).
每个月,月球都会经过近地点(离地球最近的点)和远地点(离地球最远的点)。
TED演讲(视频版) 2019年11月合集
And at the perigee of the orbit, or the lowest point, it dips into the earth atmosphere and basically burns back up.
在轨道的近地点,或最低点,它浸入地球大气层,基本上燃烧起来。
BBC英语大破解
When there is a full moon on the perigee side of its orbit, it's bigger and brighter than usual, and can look especially large close to the horizon due to an optical illusion.
Li explained that after separating from the rocket, the cargo craft moves from the perigee orbit to that of the space station by means of long-range autonomous guidance and near-range autonomous control to achieve fast-docking.
An apsis (Greek:ἁψίς; plural apsides/ˈæpsᵻdiːz/, Greek: ἁψίδες) is an extreme point in an object's orbit. The word comes via Latin from Greek and is cognate with apse. For elliptic orbits about a larger body, there are two apsides, named with the prefixes peri- (fromπερί (peri), meaning "near") and ap-, or apo- (fromἀπ(ό) (ap(ó)), meaning "away from") added to a reference to the thing being orbited.