A star whose position and/or proper motion are known, so that it can be used to define a local frame of reference for relative positions or proper motions of other stars in the same area of sky.
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。