第二章堂标票和时向票— Coordinate and Time System 主要内容 TThe main contents 21协议天球坐标系 Conventional Celestial Sphere coordinate system 22协议地球坐标系 Conventional Earth Coordinate System 2.3WGS-84坐标系和我国的大地坐标系 World Geodetic System-1984 and our National Geodetic Coordinate system 2.4时间系统 Time System 2.5北斗坐标系统和时间系统 Coordinate and Time System of BDs第二章 坐标系统和时间系统——Coordinate and Time System 主要内容 The main contents 2.1 协议天球坐标系 Conventional Celestial Sphere Coordinate System 2.2 协议地球坐标系 Conventional Earth Coordinate System 2.3 WGS-84坐标系和我国的大地坐标系 World Geodetic System-1984 and our National Geodetic Coordinate System 2.4 时间系统 Time System 2.5 北斗坐标系统和时间系统 Coordinate and Time System of BDS