The Earth Radius Calculating Method in Radiowave Refractive Correction for Low Altitude Targets;
低空目标电波折射修正中地球半径计算方法
Elevation differences small compared with the earth's redius, this is proportional to the height above sea level.
高程差与地球半径相比显得很小，它与海洋面以上的高度成正比。
The diameter of Mars is slightly over half that of the earth.
火星的直径比地球的半径稍大些。
Radii of sphere surfaces
GB/T6403.1-1986球面半径
semimajor axis of ellipsoid
椭球长半轴，地球长半轴
For calculating the force of gravity on a satellite, the radius of the earth is irrelevant.
计算地球作用于卫星的重力时，地球的半径是无关紧要的。
The Roche limit for the earth is a small fraction of the radius of the moon's orbit.
地球的洛希极限相当于月球轨道半径的一小部分。
An imaginary sphere of infinite extent with the earth at its center on which the stars, planets, and other heavenly bodies appear to be located.
以地球球心为中心，且具有很大半径的假想圆球。想象中，所有天体都附着在天球上。
One astronomical unit is equal to the average radius of the Earth's orBit, aBout 93, 000, 000 miles.
一个天文单位等于地球轨道的平均半径，大约是93，000，000 英里。
Influence of Rim Radius on Zero Radius Steering Resistance Moment of Drum-wheel for Lunar Rover
轮缘半径对月球车鼓形轮原地转向阻力矩影响分析
Either the northern or southern half of the earth as divided by the equator or the eastern or western half as divided by a meridian.
（地球的）半球被赤道分开的南半球或北半球，或被子午线分开的东半球或西半球
Radii of spherical surfaces of optical elements series of numerical values
GB/T3158-1982光学零件球面半径数值系列
Precision analysis of measurement of radius of curvature by interferometer
干涉仪测量球面曲率半径的精度分析
When is the Tangent Sphere Bundle with Arbitrary Constant Radius Einstein
何时任意常半径的切球丛是Einstein的(英文)
The sun lights half the earth at a time.
太阳只能照亮半面地球。
A line segment that joins the center of a sphere with any point on its surface.
球半径将心与球面上任一点起来的线段
This forms a wall whose area is up to120 feet square or a sphere or hemisphere with a radius of up to12 feet.
这样产生的墙可达120平方呎面积或是半径达12呎的球或半球。
courser of desert and semidesert regions of the Old World.
东半球沙漠或半沙漠地区的走鸻。
The western part of the earth, especially Europe and the Western Hemisphere.
西方地球的西部，尤指欧洲和西半球