第三宇宙速度ν_3及获得ν_3所需的火箭推进剂量与地球在公转轨道上的位置的关系

THIRD COSMIC SPEED V_3 AND RELATION BETWEEN QUANTITY OF ROCKET PROPELLANT NEEDED TO OBTAIN V_3 AND THE EARTH'S POSITION ON ITS ORBIT

计算结果表明，从地球在公转轨道上的近日点到远日点，第三宇宙速度的值单调增加，获得相应的速度值所需要的火箭推进剂量的增加幅度约达１０％，从而在理论上指出了这一问题中减轻火箭重量的一个有效途径是尽可能接近近日点发射．

This calculation shows that the value of the third cosmic speed increases monotonously from perihelion to aphelion and the increase range of propellant quantity needed to obtain corresponding speed reaches about 10%.These results point out theoretically that an effectual way to reduce rocket weight in this conditon is to launch as near to the sun as possible,