A great circle on the celestial sphere passing through a celestial object and the celestial poles; also known as meridian of hour angle. It is perpendicular to the celestial equator.
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。