Pith Number

pith:QPSHN4QK

pith:2018:QPSHN4QKB2HDDSWMM7AAHWZALC

not attested not anchored not stored refs pending

On times and shadows: the observational analemma

Alejandro Gangui, Cecilia Lastra, Fernando Karaseur

arxiv:1812.10719 v1 · 2018-12-27 · physics.ed-ph · astro-ph.IM · physics.hist-ph · physics.pop-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{QPSHN4QKB2HDDSWMM7AAHWZALC}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

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.

Receipt and verification

First computed	2026-05-17T23:57:20.200990Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

83e476f20a0e8e31cacc67c003db2058a2b2342311dc5491d3a09283d7dd0209

Aliases

arxiv: 1812.10719 · arxiv_version: 1812.10719v1 · doi: 10.48550/arxiv.1812.10719 · pith_short_12: QPSHN4QKB2HD · pith_short_16: QPSHN4QKB2HDDSWM · pith_short_8: QPSHN4QK

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/QPSHN4QKB2HDDSWMM7AAHWZALC \
  | 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: 83e476f20a0e8e31cacc67c003db2058a2b2342311dc5491d3a09283d7dd0209

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2639cc667204ad0181cb17996512da34a6e7de88f8be223fd20116b83e7f8269",
    "cross_cats_sorted": [
      "astro-ph.IM",
      "physics.hist-ph",
      "physics.pop-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.ed-ph",
    "submitted_at": "2018-12-27T13:33:13Z",
    "title_canon_sha256": "e6eee315db564eb97c67bb0f0678e0cc2641e5052df241eced08abedef10e5e7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1812.10719",
    "kind": "arxiv",
    "version": 1
  }
}