zenithn.顶点；天顶；全盛zenith wet delay model天顶湿延迟模型Zenithal blind section天顶盲区Zenith Laptop Computer顶峰牌计算机zenithal angle diagram天顶角图Zenith hydrostatic delay天顶静力延迟zenith observation angle观测天顶角zenith noise temperature天顶噪声温度Zenith Radio Corporation齐尼思无线电公司zenith-angle variation(宇宙射线强度的) 天顶角变化zenith tropospheric delay对流层延迟