An optical telescope with a micrometer is used to precisely adjust the polar axis of an equatorial radio telescope and any precise dial and clock will not be needed.
使用一具附有测微器的光学望远镜配合赤道式射电望远镜进行极轴精密调整，不需用精确的度盘和记时设备。
2
From Cambrian to the end of Middle Triassic, the Siberia-eastern China-Australia axis rotated from an eat-westward equatorial arrangement to south-northward longitudinal arrangement.