标准地球

并在VC++环境下，以标准地球空间数据交换格式（VCT）作为基础，实现了常用GIS数据的集成与共享。

It states how to achieve the high integration and share of GIS data on the basic of VCT in VC + + .

基于不同天文标准计算地球引力对卫星轨道的影响

Effect of Gravitational Perturbations on Satellite Orbit via Different Astronomy Standards

值得注意的是：科学家将火星列入可居住星球的范围，其衡量标准是与地球大小基本相当，温度适宜液态水。

And it 's worth noting that scientists'requirements for habitability count Mars in that category : a size relatively similar to Earth 's with temperatures that would permit liquid water .

其次，小说体现出现代都市已进入高消费阶段，最大程度满足物质需求是现代人的生活标准，揭示地球资源日益匮乏的根源。

Second , the novel reflects the modern city has entered a high stage of a consumer society . Satisfaction of their material needs is their life norm . In this case , the novel partially reveals the causes of the increasing scarcity of resources on the Earth .

再加上光速是恒定的，知道这样一盏“标准蜡烛”离地球多远（根据地球上观测的视觉亮度计算得出）就能知道它是多久以前爆发的。

Since the speed of light is constant , knowing how far away such a " standard candle " is ( calculated from its apparent brightness seen from Earth ) is to know how long ago it exploded .