geocentric

• It has some important potential applications in geodesy and geodynamics , including the definition , practical realization , and the interconnection of different reference frames , determining the geocentric positions of vlbi stations , estimation of the gravity field of the earth , and satellite orbit determination using the delay and delay rate observables
  它在大地测量和地球动力学方面很有应用潜力,如不同参考框架的定义、实现和相互连接,利用延迟和延迟速率来进行vlbi测站地心坐标的测定,地球重力场的估计和卫星定轨等。