The period from 1964 January 1 to 1965 December 31, near solar minimum, when solar and geophysical phenomena were studied by observatories around the world and by spacecraft to improve our understanding of solar–terrestrial relations.
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。