{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2014:5NIFWTIRWILQWL5MV5CX5ZE7ZF","short_pith_number":"pith:5NIFWTIR","schema_version":"1.0","canonical_sha256":"eb505b4d11b2170b2facaf457ee49fc966826a623d180b31713df2120b3504fa","source":{"kind":"arxiv","id":"1411.7790","version":1},"attestation_state":"computed","paper":{"title":"Digitization of sunspot drawings by Sp\\\"orer made in 1861-1894","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"2), (2) University Potsdam, Andrea Diercke (1, Astronomy), Carsten Denker (1) ((1) Leibniz Institute for Astrophysics Potsdam (AIP), Institute for Physics, Rainer Arlt (1)","submitted_at":"2014-11-28T09:21:29Z","abstract_excerpt":"Most of our knowledge about the Sun's activity cycle arises from sunspot observations over the last centuries since telescopes have been used for astronomy. The German astronomer Gustav Sp\\\"orer observed almost daily the Sun from 1861 until the beginning of 1894 and assembled a 33-year collection of sunspot data covering a total of 445 solar rotation periods. These sunspot drawings were carefully placed on an equidistant grid of heliographic longitude and latitude for each rotation period, which were then copied to copper plates for a lithographic reproduction of the drawings in astronomical j"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1411.7790","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-11-28T09:21:29Z","cross_cats_sorted":[],"title_canon_sha256":"65fb70e9b5b245178f00e92037a9dc7bc67fe6dcb8efc600646dcc3be8b6599f","abstract_canon_sha256":"fd61235f519941c09b195dc0cc4b64eb51d427441a4f13ce45d1bcafca81baae"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:27:24.351909Z","signature_b64":"1SZ9OuncLh0D/bjz7JkyEI2TIqHXk+xywvaD+HF1u0GzGJ6wzEVnDhsidlsgkdDVjh3UkH8+lbOutAZSCNMDDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"eb505b4d11b2170b2facaf457ee49fc966826a623d180b31713df2120b3504fa","last_reissued_at":"2026-05-18T01:27:24.351478Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:27:24.351478Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Digitization of sunspot drawings by Sp\\\"orer made in 1861-1894","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"2), (2) University Potsdam, Andrea Diercke (1, Astronomy), Carsten Denker (1) ((1) Leibniz Institute for Astrophysics Potsdam (AIP), Institute for Physics, Rainer Arlt (1)","submitted_at":"2014-11-28T09:21:29Z","abstract_excerpt":"Most of our knowledge about the Sun's activity cycle arises from sunspot observations over the last centuries since telescopes have been used for astronomy. The German astronomer Gustav Sp\\\"orer observed almost daily the Sun from 1861 until the beginning of 1894 and assembled a 33-year collection of sunspot data covering a total of 445 solar rotation periods. These sunspot drawings were carefully placed on an equidistant grid of heliographic longitude and latitude for each rotation period, which were then copied to copper plates for a lithographic reproduction of the drawings in astronomical j"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1411.7790","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":""},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1411.7790","created_at":"2026-05-18T01:27:24.351540+00:00"},{"alias_kind":"arxiv_version","alias_value":"1411.7790v1","created_at":"2026-05-18T01:27:24.351540+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1411.7790","created_at":"2026-05-18T01:27:24.351540+00:00"},{"alias_kind":"pith_short_12","alias_value":"5NIFWTIRWILQ","created_at":"2026-05-18T12:28:14.216126+00:00"},{"alias_kind":"pith_short_16","alias_value":"5NIFWTIRWILQWL5M","created_at":"2026-05-18T12:28:14.216126+00:00"},{"alias_kind":"pith_short_8","alias_value":"5NIFWTIR","created_at":"2026-05-18T12:28:14.216126+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/5NIFWTIRWILQWL5MV5CX5ZE7ZF","json":"https://pith.science/pith/5NIFWTIRWILQWL5MV5CX5ZE7ZF.json","graph_json":"https://pith.science/api/pith-number/5NIFWTIRWILQWL5MV5CX5ZE7ZF/graph.json","events_json":"https://pith.science/api/pith-number/5NIFWTIRWILQWL5MV5CX5ZE7ZF/events.json","paper":"https://pith.science/paper/5NIFWTIR"},"agent_actions":{"view_html":"https://pith.science/pith/5NIFWTIRWILQWL5MV5CX5ZE7ZF","download_json":"https://pith.science/pith/5NIFWTIRWILQWL5MV5CX5ZE7ZF.json","view_paper":"https://pith.science/paper/5NIFWTIR","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1411.7790&json=true","fetch_graph":"https://pith.science/api/pith-number/5NIFWTIRWILQWL5MV5CX5ZE7ZF/graph.json","fetch_events":"https://pith.science/api/pith-number/5NIFWTIRWILQWL5MV5CX5ZE7ZF/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/5NIFWTIRWILQWL5MV5CX5ZE7ZF/action/timestamp_anchor","attest_storage":"https://pith.science/pith/5NIFWTIRWILQWL5MV5CX5ZE7ZF/action/storage_attestation","attest_author":"https://pith.science/pith/5NIFWTIRWILQWL5MV5CX5ZE7ZF/action/author_attestation","sign_citation":"https://pith.science/pith/5NIFWTIRWILQWL5MV5CX5ZE7ZF/action/citation_signature","submit_replication":"https://pith.science/pith/5NIFWTIRWILQWL5MV5CX5ZE7ZF/action/replication_record"}},"created_at":"2026-05-18T01:27:24.351540+00:00","updated_at":"2026-05-18T01:27:24.351540+00:00"}