Pith Number

pith:6V4RUPYK

pith:2011:6V4RUPYKXVLEKDK5XEIYTMOPE4

not attested not anchored not stored refs pending

The astronomical orientation of the urban plan of Alexandria

Giulio Magli, Luisa Ferro

arxiv:1103.0939 v2 · 2011-03-04 · 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{6V4RUPYKXVLEKDK5XEIYTMOPE4}

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	2026-05-18T03:41:40.515169Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f5791a3f0abd56450d5db91189b1cf27215ef4667f7184af3e9a095d1c59c519

Aliases

arxiv: 1103.0939 · arxiv_version: 1103.0939v2 · doi: 10.48550/arxiv.1103.0939 · pith_short_12: 6V4RUPYKXVLE · pith_short_16: 6V4RUPYKXVLEKDK5 · pith_short_8: 6V4RUPYK

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/6V4RUPYKXVLEKDK5XEIYTMOPE4 \
  | 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: f5791a3f0abd56450d5db91189b1cf27215ef4667f7184af3e9a095d1c59c519

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e28b7e8bcfaf953e451b9ab2c40c9082668abc4fd4550b7d813898805fbd77ee",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.hist-ph",
    "submitted_at": "2011-03-04T16:10:47Z",
    "title_canon_sha256": "75e4f5f5ea2b03822a1c47af2ccd2092829d6cfbb1ac22a5397c87c4fd4019b2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1103.0939",
    "kind": "arxiv",
    "version": 2
  }
}