1. Professor, National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China; Univ. of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Time Reference and Applications, Chinese Academy of Sciences, Xi’an 710600, China (corresponding author). ORCID: .
2. Professor, School of Earth and Planetary Sciences, Curtin Univ., Perth, WA 6845, Australia. ORCID: .
3. Professor, National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China; Univ. of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Time Reference and Applications, Chinese Academy of Sciences, Xi’an 710600, China.