A telescope constrained to rotate in the plane of the meridian about a horizontal axis mounted east–west. It is used for measuring the times of meridian transit of stars and hence deriving clock error or longitude. See also transit circle.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。