{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1362262944892449536.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1098/rsta.1981.0206"}},{"identifier":{"@type":"URI","@value":"https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.1981.0206"}},{"identifier":{"@type":"URI","@value":"https://royalsocietypublishing.org/rsta/article-pdf/303/1477/327/278104/rsta.1981.0206.pdf"}}],"dc:title":[{"@value":"The free librations of a dissipative Moon"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title>\n                  <jats:p>Dissipation in the Moon produces a small offset, ca. 0.23\", of the Moon's rotation axis from the plane defined by the ecliptic and lunar orbit normals. Both solid body tidal friction and viscous fluid friction at a core—mantle interface are plausible mechanisms. In this paper, I discuss the merits of each and find that solid friction requires a low lunar tidal Q,ca. 28, while turbulent fluid friction requires a core of radius 330 km to cause the signature observed by lunar laser ranging. Large (ca. 0.4—8.0\") free librations of the lunar figure have also been detected by laser ranging. Both a very recent impact on the Moon and fluid turbulence in the lunar core are plausible mechanisms for generating these free librations.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380307543089117056","@type":"Researcher","foaf:name":[{"@value":"C. F. Yoder"}],"jpcoar:affiliationName":[{"@value":"Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasedena, California 91109, U. S. A."}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00804614"},{"@type":"EISSN","@value":"20540272"}],"prism:publicationName":[{"@value":"Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences"}],"dc:publisher":[{"@value":"The Royal Society"}],"prism:publicationDate":"1981-12-24","prism:volume":"303","prism:number":"1477","prism:startingPage":"327","prism:endingPage":"338"},"reviewed":"false","dc:rights":["https://royalsociety.org/journals/ethics-policies/data-sharing-mining/"],"url":[{"@id":"https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.1981.0206"},{"@id":"https://royalsocietypublishing.org/rsta/article-pdf/303/1477/327/278104/rsta.1981.0206.pdf"}],"createdAt":"2006-12-15","modifiedAt":"2026-02-26","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360567181416247808","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Development of a digital zenith telescope for advanced astrometry"}]},{"@id":"https://cir.nii.ac.jp/crid/2050870366933162240","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Thermo-optical simulation and experiment for the assessment of single, hollow, and large aperture retroreflector for lunar laser ranging"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1098/rsta.1981.0206"},{"@type":"CROSSREF","@value":"10.1007/s11433-012-4673-1_references_DOI_FHlAzngP7zYDPMIQzEPwZICmhnJ"},{"@type":"CROSSREF","@value":"10.1186/s40623-016-0475-4_references_DOI_FHlAzngP7zYDPMIQzEPwZICmhnJ"}]}