Pith Number

pith:7OTDEWKH

pith:2013:7OTDEWKHIYU35NGBZSZTNJLTQY

not attested not anchored not stored refs pending

The Thousand Star Magnitudes in the Catalogues of Ptolemy, Al Sufi, and Tycho Are All Corrected For Atmospheric Extinction

Bradley E. Schaefer (Louisiana State University)

arxiv:1303.1833 v1 · 2013-03-07 · astro-ph.IM · astro-ph.SR · physics.hist-ph

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7OTDEWKHIYU35NGBZSZTNJLTQY}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Cited by

1 paper in Pith

The forgotten bright star: Theta Eridani as a millenary stellar transient observed by Hipparchus, Ptolemy and al-Sufi

Receipt and verification

First computed	2026-05-18T03:31:32.245116Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fba63259474629beb4c1ccb336a57386173881a3f4a1a731ade9cda6beae6d3c

Aliases

arxiv: 1303.1833 · arxiv_version: 1303.1833v1 · doi: 10.48550/arxiv.1303.1833 · pith_short_12: 7OTDEWKHIYU3 · pith_short_16: 7OTDEWKHIYU35NGB · pith_short_8: 7OTDEWKH

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/7OTDEWKHIYU35NGBZSZTNJLTQY \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: fba63259474629beb4c1ccb336a57386173881a3f4a1a731ade9cda6beae6d3c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5f21ffa583e54f35a00701e6292b07784f878c8498815de74ac4fa3ae80a773f",
    "cross_cats_sorted": [
      "astro-ph.SR",
      "physics.hist-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2013-03-07T21:37:40Z",
    "title_canon_sha256": "eedc702c554f6075d677e79847a1e1d7b8f62306a4606da7cb46c40a83c023b3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1303.1833",
    "kind": "arxiv",
    "version": 1
  }
}