Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997cha%26a..21..254x&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 21, Issue 2, p. 254-254.
Astronomy and Astrophysics
Astrophysics
Scientific paper
High precision data obtained by classical optical instruments and new
techniques are used in a re-measurement of the free nutation of the
liquid core of the earth. A retrograde circulare motion with a period of
415-418 d and a sub-mas amplitude is obtained.
Xiao Nai-Yuan
Zhang Han-Wei
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