The points, diametrically opposite, at which the orbit of a planet intersects the plane of the ecliptic, or at which the orbit of a satellite intersects the orbital plane of a planet.
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。