Referring to the rising or setting of a celestial object at or shortly after sunset; also spelled acronychal or acronycal. A planet’s rising is acronical when it is at opposition.
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。