近地点

当人造卫星达到近地点时，就会发射一根小探针，这根探针将进入行星的大气层。

Once the satellite reaches perigee , it will eject a small probe which enter the planet 's atmosphere .

本文提供一种保持轨道形状和近地点位置不变的控制方法。

This paper offers a method which maintain orbital shape and perigee location .

针对中低轨道卫星，对平面内卫星半长轴a、偏心率e和近地点幅角ω联合调整，以及平面外轨道倾角调整等进行了理论推导。

The theory derivation for in-plane maneuver on semimajor axis , eccentricity and perigee argument and out-plane maneuver on orbit inclination was presented in this paper .

用AE-D卫星近地点上观测的n（He）估算湍流层顶高度

An evaluation of the turbopause altitude using n ( he ) observed at perigees of ae-d satellite

本文讨论了一种大气密度标高的计算方法，同时从我国第二颗卫星近地点高度变化的分析测得了四个平均密度标高H值。

In this paper a method for computing density scale height H is discussed . At the same time , from the analysis of variation in perigee height of the China second satellite , four mean values of density scale height H are determined .

本文分析了AED极轨卫星近地点的变化及其相应的大气膨胀和密度分布情况。

In this paper , variations of AE-D 's perigee altitudes , the corresponding atmospheric expansion and the density distributions are analyzed .

而当哈雷彗星第二次过近地点时期，利用M24微机数据采集系统，对该彗星进行追踪观测。得到在此期间哈雷彗星21厘米射电连续辐射强度的上限为2.22Jy（5σ）。

The upper limit of the intensity of the 21-cm wavelength continuous radiation of Halley 's Comet is 2.22 Jy ( 5 σ) .

采用近地点上的n（He）观测资料，根据大气数密度在低层内均匀混合和高层内扩散分离的不同垂直分布特征，粗略地估算出湍流层顶的高度Zt及其变化。

Besides , the data of n ( He ) observed at perigees are used to roughly estimate the altitudes of the turbopause Z t and their variations according the two distinct vertical distributions of atmospheric composition in low and upper atmospheres : the homogeneous mixing and the diffusive separation .

近地点变轨固体火箭发动机动平衡试验

The Test of Dynamic Balance for Perigee Kick Solid Rocket Motor

月球每年有一次达到它的绝对近地点。

The Moon reaches its absolute perigee once a year .

近地点再入红外辐射测量研究

The Study for Infrared Measurement of the Reentry-Body Near Earth

当月球与地球到达它们的近地点和近日点的时间恰好重合时，就会引起最大的潮汐。

When perigee and perihelion coincide tidal range is at its greatest .

卫星轨道近地点和远地点能量平衡式

Energy Balance Equation at Perigee and Apogee of Satellite Orbit

即使在近地点，它（离我们）也还有三千四百万英里远。

It is still 34 million miles away even at its closest point .

近地点变轨发动机高空喷管性能预示研究

Altitude performance prediction of perigee kick motor nozzle

从我国第二颗卫星近地点高度变化的分析测定平均密度标高

Mean Density Scale Heights From Analysis of Variation in Perigee Height of China Second Satellite

现在我们要看看，近地点和远地点的情况。

Now we want to know what the situation is with perigee and with apogee .

卫星轨道近地点幅角

Argument of perigee of satellite orbit

不同地貌条件下雷达高度表近地点灵敏度设计计算及优化调整

Design Calculation and Optimization Adjustment for Perigee Sensitivity of Radar Altimeter under Various Geographical Physiognomy Conditions

椭圆轨道半长轴为，近地点到远地点。

A The ellipse has a semimajor axis A , - 2a perigee to apogee & is2a .

如果这是一个围绕，地球的椭圆形轨道，那么这是近地点，这是远地点。

If this is an ellipse around the Earth , then this would be perigee and this would be apogee .

嫦娥三号已经按照计划进入了近地点高度200公里、远地点高度约38万公里的地月转移轨道。

The probe entered the earth-moon transfer orbit as scheduled , with a perigee of 200 kilometers and apogee of 380,000 kilometers .

另外，平面外倾角调整应尽可能在近地点和远地点完成，以使对升交点赤经的影响最小。

Moreover , out-plane inclination maneuver should be completed at perigee or apogee to influence right ascension of ascending node the least .

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。

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

巧合的是，最大圆月也将到达到距地球最近距离、即人们所知的近地点。

Coincidentally , it will also have reached the point in its orbit that is closest to the Earth , known as ' perigee ' .

日月改正数误差最值仅出现在太阳和月亮同时运行至近地点附近时。

The maximum error of rectified number of sun and moon appears only when the sun and the moon run near perigee at the same time .

给出了这些转移轨道的近地点和着月点的轨迹，并讨论了轨迹随飞行时间变化的特性。

In addition , the locus of perigee and lunar impact points are given and the characteristic of the locus with variation of the transfer time are discussed .

你现在有黄道经度的近地点的阳光平均夏季冬至，你选择了一年（而有效地为整个一年）。

You now have the ecliptic longitude of perigee of the sun for the mean summer solstice of your chosen year ( and effectively for the entire year ) .

知道周期，知道远地点，和近地点在哪里，知道轨道周期-，知道了想知道的一切。

We know the period , we know where apogee is , we know where perigee is , - we know the orbital period & anything we want to know .

在轨道关联中考虑到初轨计算的误差特征，选取近地点高度、轨道倾角和升交点赤经作为用于关联的轨道量。

The height of perigee , inclination and right ascension of ascending node ( RAAN ) are chosen as characteristic quantity in the orbit correlation considering the character of the error of IOD process .