{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:HHNEXNJ5YH7KDUAXHPKIT4L4JB","short_pith_number":"pith:HHNEXNJ5","canonical_record":{"source":{"id":"2110.09037","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2021-10-18T06:20:58Z","cross_cats_sorted":[],"title_canon_sha256":"da0020517ee7c4469f75b5b127666245333586e4984c4bdf1257c57ca95ea9c2","abstract_canon_sha256":"c465897b2a1567dbf0a00224431fd8919fa22e6e4e91ae60c6f48c4f115c0ce1"},"schema_version":"1.0"},"canonical_sha256":"39da4bb53dc1fea1d0173bd489f17c4853bedb9302062edb3845a5e7d63836eb","source":{"kind":"arxiv","id":"2110.09037","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2110.09037","created_at":"2026-07-05T03:27:05Z"},{"alias_kind":"arxiv_version","alias_value":"2110.09037v1","created_at":"2026-07-05T03:27:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2110.09037","created_at":"2026-07-05T03:27:05Z"},{"alias_kind":"pith_short_12","alias_value":"HHNEXNJ5YH7K","created_at":"2026-07-05T03:27:05Z"},{"alias_kind":"pith_short_16","alias_value":"HHNEXNJ5YH7KDUAX","created_at":"2026-07-05T03:27:05Z"},{"alias_kind":"pith_short_8","alias_value":"HHNEXNJ5","created_at":"2026-07-05T03:27:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:HHNEXNJ5YH7KDUAXHPKIT4L4JB","target":"record","payload":{"canonical_record":{"source":{"id":"2110.09037","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2021-10-18T06:20:58Z","cross_cats_sorted":[],"title_canon_sha256":"da0020517ee7c4469f75b5b127666245333586e4984c4bdf1257c57ca95ea9c2","abstract_canon_sha256":"c465897b2a1567dbf0a00224431fd8919fa22e6e4e91ae60c6f48c4f115c0ce1"},"schema_version":"1.0"},"canonical_sha256":"39da4bb53dc1fea1d0173bd489f17c4853bedb9302062edb3845a5e7d63836eb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:27:05.616641Z","signature_b64":"PbKZ4YMUIPPgTyvejeS4TxlDBr0JlmdFUCqgV86knRHdHxnoZZcZ6h63aoaGLWK8o1hr5whpKxAJ412v8CJtAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"39da4bb53dc1fea1d0173bd489f17c4853bedb9302062edb3845a5e7d63836eb","last_reissued_at":"2026-07-05T03:27:05.616161Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:27:05.616161Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2110.09037","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:27:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yispMXUfxU76EySLHZ5+OOXOKSr7tII3TPzJFNKLh14TxtARdOPlt8trz063YkdStSy0hs5/3LnJ4RpOiu0gDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T04:46:36.703945Z"},"content_sha256":"235ba5fd48a967802bde34732b1e2b5aab941c28550844c832d8a73c6bffd1aa","schema_version":"1.0","event_id":"sha256:235ba5fd48a967802bde34732b1e2b5aab941c28550844c832d8a73c6bffd1aa"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:HHNEXNJ5YH7KDUAXHPKIT4L4JB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the Relation of the Lunar Recession and the Length-of-the-Day","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Andre Maeder, Vesselin G. Gueorguiev","submitted_at":"2021-10-18T06:20:58Z","abstract_excerpt":"We review the problem of the consistency between the observed values of the lunar recession from Lunar Laser Ranging (LLR) and of the increase of the length-of-the-day (LOD). From observations of lunar occultations completed by recent IERS data, we derive a variation rate of the LOD equal to 1.09 ms/cy from 1680 to 2020, which compares well with McCarthy and Babcock (1986) and Sidorenkov (2005). This rate is lower than the mean rate of 1.78 ms/cy derived by Stephenson et al. (2016) on the basis of eclipses in the Antiquity and Middle Age. The difference in the two observed rates starts at the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2110.09037","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2110.09037/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:27:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LsKk5qUNEEH26dcIr0W3cr9WF2OLgovJtTO59XrLQm1OFQHqHChedYhUFgMfQamSp7bPSmq4b3hNvSZiNv9OAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T04:46:36.704920Z"},"content_sha256":"e88cb42a6fdd2195bfcb8bd8d6f64d8dc69e0bb3268a68c2da3b967bca133264","schema_version":"1.0","event_id":"sha256:e88cb42a6fdd2195bfcb8bd8d6f64d8dc69e0bb3268a68c2da3b967bca133264"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HHNEXNJ5YH7KDUAXHPKIT4L4JB/bundle.json","state_url":"https://pith.science/pith/HHNEXNJ5YH7KDUAXHPKIT4L4JB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HHNEXNJ5YH7KDUAXHPKIT4L4JB/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-04T04:46:36Z","links":{"resolver":"https://pith.science/pith/HHNEXNJ5YH7KDUAXHPKIT4L4JB","bundle":"https://pith.science/pith/HHNEXNJ5YH7KDUAXHPKIT4L4JB/bundle.json","state":"https://pith.science/pith/HHNEXNJ5YH7KDUAXHPKIT4L4JB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HHNEXNJ5YH7KDUAXHPKIT4L4JB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:HHNEXNJ5YH7KDUAXHPKIT4L4JB","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"c465897b2a1567dbf0a00224431fd8919fa22e6e4e91ae60c6f48c4f115c0ce1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2021-10-18T06:20:58Z","title_canon_sha256":"da0020517ee7c4469f75b5b127666245333586e4984c4bdf1257c57ca95ea9c2"},"schema_version":"1.0","source":{"id":"2110.09037","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2110.09037","created_at":"2026-07-05T03:27:05Z"},{"alias_kind":"arxiv_version","alias_value":"2110.09037v1","created_at":"2026-07-05T03:27:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2110.09037","created_at":"2026-07-05T03:27:05Z"},{"alias_kind":"pith_short_12","alias_value":"HHNEXNJ5YH7K","created_at":"2026-07-05T03:27:05Z"},{"alias_kind":"pith_short_16","alias_value":"HHNEXNJ5YH7KDUAX","created_at":"2026-07-05T03:27:05Z"},{"alias_kind":"pith_short_8","alias_value":"HHNEXNJ5","created_at":"2026-07-05T03:27:05Z"}],"graph_snapshots":[{"event_id":"sha256:e88cb42a6fdd2195bfcb8bd8d6f64d8dc69e0bb3268a68c2da3b967bca133264","target":"graph","created_at":"2026-07-05T03:27:05Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2110.09037/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We review the problem of the consistency between the observed values of the lunar recession from Lunar Laser Ranging (LLR) and of the increase of the length-of-the-day (LOD). From observations of lunar occultations completed by recent IERS data, we derive a variation rate of the LOD equal to 1.09 ms/cy from 1680 to 2020, which compares well with McCarthy and Babcock (1986) and Sidorenkov (2005). This rate is lower than the mean rate of 1.78 ms/cy derived by Stephenson et al. (2016) on the basis of eclipses in the Antiquity and Middle Age. The difference in the two observed rates starts at the ","authors_text":"Andre Maeder, Vesselin G. Gueorguiev","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2021-10-18T06:20:58Z","title":"On the Relation of the Lunar Recession and the Length-of-the-Day"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2110.09037","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:235ba5fd48a967802bde34732b1e2b5aab941c28550844c832d8a73c6bffd1aa","target":"record","created_at":"2026-07-05T03:27:05Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"c465897b2a1567dbf0a00224431fd8919fa22e6e4e91ae60c6f48c4f115c0ce1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2021-10-18T06:20:58Z","title_canon_sha256":"da0020517ee7c4469f75b5b127666245333586e4984c4bdf1257c57ca95ea9c2"},"schema_version":"1.0","source":{"id":"2110.09037","kind":"arxiv","version":1}},"canonical_sha256":"39da4bb53dc1fea1d0173bd489f17c4853bedb9302062edb3845a5e7d63836eb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"39da4bb53dc1fea1d0173bd489f17c4853bedb9302062edb3845a5e7d63836eb","first_computed_at":"2026-07-05T03:27:05.616161Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:27:05.616161Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"PbKZ4YMUIPPgTyvejeS4TxlDBr0JlmdFUCqgV86knRHdHxnoZZcZ6h63aoaGLWK8o1hr5whpKxAJ412v8CJtAg==","signature_status":"signed_v1","signed_at":"2026-07-05T03:27:05.616641Z","signed_message":"canonical_sha256_bytes"},"source_id":"2110.09037","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:235ba5fd48a967802bde34732b1e2b5aab941c28550844c832d8a73c6bffd1aa","sha256:e88cb42a6fdd2195bfcb8bd8d6f64d8dc69e0bb3268a68c2da3b967bca133264"],"state_sha256":"dca340e810cab05bac662c62bdb2abf6c152827213948a4a6422e0e8cc993c71"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ywu1ECmPJ1yXmmk4XQMEv9eGWgLxePpScUC8yCTxjXQLZe4v/9wbKaVOi4caPheTQsEwqArIoU8uhL1BkuUmCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T04:46:36.713062Z","bundle_sha256":"e48e5d286363715d792933d4fe634bacc30c68735645a1f4c16db7083eafde11"}}