{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:IUPQJ3IDJARKRPELNGLOPSAUVC","short_pith_number":"pith:IUPQJ3ID","canonical_record":{"source":{"id":"1211.2755","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-11-12T19:50:42Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"5779a5d3eb3a0da93b49fde0b981100a4bebfb5ffac5f047c613545f177ff40b","abstract_canon_sha256":"faf6f7fc46481b3a7a357644c665e771e1f614cf0ca5faa68a4a08fc1a05b5ee"},"schema_version":"1.0"},"canonical_sha256":"451f04ed034822a8bc8b6996e7c814a8817a047956d6497808a331a4a931bf56","source":{"kind":"arxiv","id":"1211.2755","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1211.2755","created_at":"2026-05-18T03:41:01Z"},{"alias_kind":"arxiv_version","alias_value":"1211.2755v1","created_at":"2026-05-18T03:41:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1211.2755","created_at":"2026-05-18T03:41:01Z"},{"alias_kind":"pith_short_12","alias_value":"IUPQJ3IDJARK","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_16","alias_value":"IUPQJ3IDJARKRPEL","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_8","alias_value":"IUPQJ3ID","created_at":"2026-05-18T12:27:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:IUPQJ3IDJARKRPELNGLOPSAUVC","target":"record","payload":{"canonical_record":{"source":{"id":"1211.2755","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-11-12T19:50:42Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"5779a5d3eb3a0da93b49fde0b981100a4bebfb5ffac5f047c613545f177ff40b","abstract_canon_sha256":"faf6f7fc46481b3a7a357644c665e771e1f614cf0ca5faa68a4a08fc1a05b5ee"},"schema_version":"1.0"},"canonical_sha256":"451f04ed034822a8bc8b6996e7c814a8817a047956d6497808a331a4a931bf56","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:41:01.868019Z","signature_b64":"N1DTWBIzHT0vJK6fXMl0otj2oF1iLUYvYbdIoShkyz2xZjDwK22Wc5qMzZxQCI7vsUejvW4njphXEfGgQx7PCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"451f04ed034822a8bc8b6996e7c814a8817a047956d6497808a331a4a931bf56","last_reissued_at":"2026-05-18T03:41:01.867261Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:41:01.867261Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1211.2755","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":"2026-05-18T03:41:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5jIYKctmvRbAgXRLltjidlzXret8s8mBM/50diJ4zpd1olsrpyoH7X5ruxjgPZ9l0qe/YhSM2gZ8C0H+mhlNBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T18:13:53.988671Z"},"content_sha256":"befaf151189f517b9b70341de77d8c0aa36f8301c1694c2cbb54939e2115fbc4","schema_version":"1.0","event_id":"sha256:befaf151189f517b9b70341de77d8c0aa36f8301c1694c2cbb54939e2115fbc4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:IUPQJ3IDJARKRPELNGLOPSAUVC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"L'Equazione del Tempo","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.IM","authors_text":"Costantino Sigismondi","submitted_at":"2012-11-12T19:50:42Z","abstract_excerpt":"The equation of time is fundamental for calculating the rising and setting times of the Sun. The concepts of sidereal and solar day and locak noon, we show how the length of the day depends on solar declination and Earth's orbit position, and also their influence on the local noon shift. In particular we show why in the month of July the setting time is rather constant, while the daylight reduces constantly."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1211.2755","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:41:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/KHgEhje6KlG2h8+0c2sDB27nz2L81Ga8EVN1QV/tupqvI5FudtwvPmlPY3DsQVAypakrMUzIBDZX17PZ7L+AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T18:13:53.989007Z"},"content_sha256":"8db5407b9fddf42e62f660361e59ee699d4e9fffc8bc925475af77cef7d7dca0","schema_version":"1.0","event_id":"sha256:8db5407b9fddf42e62f660361e59ee699d4e9fffc8bc925475af77cef7d7dca0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IUPQJ3IDJARKRPELNGLOPSAUVC/bundle.json","state_url":"https://pith.science/pith/IUPQJ3IDJARKRPELNGLOPSAUVC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IUPQJ3IDJARKRPELNGLOPSAUVC/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":"2026-06-20T18:13:53Z","links":{"resolver":"https://pith.science/pith/IUPQJ3IDJARKRPELNGLOPSAUVC","bundle":"https://pith.science/pith/IUPQJ3IDJARKRPELNGLOPSAUVC/bundle.json","state":"https://pith.science/pith/IUPQJ3IDJARKRPELNGLOPSAUVC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IUPQJ3IDJARKRPELNGLOPSAUVC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:IUPQJ3IDJARKRPELNGLOPSAUVC","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":"faf6f7fc46481b3a7a357644c665e771e1f614cf0ca5faa68a4a08fc1a05b5ee","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-11-12T19:50:42Z","title_canon_sha256":"5779a5d3eb3a0da93b49fde0b981100a4bebfb5ffac5f047c613545f177ff40b"},"schema_version":"1.0","source":{"id":"1211.2755","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1211.2755","created_at":"2026-05-18T03:41:01Z"},{"alias_kind":"arxiv_version","alias_value":"1211.2755v1","created_at":"2026-05-18T03:41:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1211.2755","created_at":"2026-05-18T03:41:01Z"},{"alias_kind":"pith_short_12","alias_value":"IUPQJ3IDJARK","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_16","alias_value":"IUPQJ3IDJARKRPEL","created_at":"2026-05-18T12:27:09Z"},{"alias_kind":"pith_short_8","alias_value":"IUPQJ3ID","created_at":"2026-05-18T12:27:09Z"}],"graph_snapshots":[{"event_id":"sha256:8db5407b9fddf42e62f660361e59ee699d4e9fffc8bc925475af77cef7d7dca0","target":"graph","created_at":"2026-05-18T03:41:01Z","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"},"paper":{"abstract_excerpt":"The equation of time is fundamental for calculating the rising and setting times of the Sun. The concepts of sidereal and solar day and locak noon, we show how the length of the day depends on solar declination and Earth's orbit position, and also their influence on the local noon shift. In particular we show why in the month of July the setting time is rather constant, while the daylight reduces constantly.","authors_text":"Costantino Sigismondi","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-11-12T19:50:42Z","title":"L'Equazione del Tempo"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1211.2755","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:befaf151189f517b9b70341de77d8c0aa36f8301c1694c2cbb54939e2115fbc4","target":"record","created_at":"2026-05-18T03:41:01Z","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":"faf6f7fc46481b3a7a357644c665e771e1f614cf0ca5faa68a4a08fc1a05b5ee","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2012-11-12T19:50:42Z","title_canon_sha256":"5779a5d3eb3a0da93b49fde0b981100a4bebfb5ffac5f047c613545f177ff40b"},"schema_version":"1.0","source":{"id":"1211.2755","kind":"arxiv","version":1}},"canonical_sha256":"451f04ed034822a8bc8b6996e7c814a8817a047956d6497808a331a4a931bf56","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"451f04ed034822a8bc8b6996e7c814a8817a047956d6497808a331a4a931bf56","first_computed_at":"2026-05-18T03:41:01.867261Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:41:01.867261Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"N1DTWBIzHT0vJK6fXMl0otj2oF1iLUYvYbdIoShkyz2xZjDwK22Wc5qMzZxQCI7vsUejvW4njphXEfGgQx7PCw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:41:01.868019Z","signed_message":"canonical_sha256_bytes"},"source_id":"1211.2755","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:befaf151189f517b9b70341de77d8c0aa36f8301c1694c2cbb54939e2115fbc4","sha256:8db5407b9fddf42e62f660361e59ee699d4e9fffc8bc925475af77cef7d7dca0"],"state_sha256":"f3863dd41995f9f1cd73457b5e32a0dee36a1b27072a0b113dc13326442e8fe4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/1SyHCmMNxjiQG2ZJWc5ryzlErKU/7Zvxkz/vyxlRasp7dX9oXC/XNSj8NGf3as6C7IKFTI28owONBcP3H/qDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-20T18:13:53.990901Z","bundle_sha256":"77274484dd4fa7b9985def4544ba774e5660f5d709a9d2c1440b3c1cc98776c7"}}