The system of identifying stars in a constellation by Greek letters according to their approximate order of brightness. They were introduced in 1603 by J. Bayer in his star atlas Uranometria.
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。