Pith Number

pith:UUFNTDQM

pith:2017:UUFNTDQMSR2KKHTJYHXRSKLJ37

not attested not anchored not stored refs pending

Differential refraction, 2017 winter solstice timing and true ecliptic obliquity measured at the meridian line of Santa Maria degli Angeli in Rome

Costantino Sigismondi

arxiv:1802.02056 v1 · 2017-12-30 · physics.pop-ph · 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{UUFNTDQMSR2KKHTJYHXRSKLJ37}

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	2026-05-18T00:24:11.022919Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a50ad98e0c9474a51e69c1ef192969dfdf05868d9ef95e022b19b12e6b1bc2c6

Aliases

arxiv: 1802.02056 · arxiv_version: 1802.02056v1 · doi: 10.48550/arxiv.1802.02056 · pith_short_12: UUFNTDQMSR2K · pith_short_16: UUFNTDQMSR2KKHTJ · pith_short_8: UUFNTDQM

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/UUFNTDQMSR2KKHTJYHXRSKLJ37 \
  | 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: a50ad98e0c9474a51e69c1ef192969dfdf05868d9ef95e022b19b12e6b1bc2c6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "76b7615e950445958358fae230ce169e236c4bb77532af7b4fd09d31c078eb65",
    "cross_cats_sorted": [
      "physics.hist-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.pop-ph",
    "submitted_at": "2017-12-30T00:04:45Z",
    "title_canon_sha256": "8b3c78440f5a59d640b5aa02c59958cb02b7d169fc99d36b21d77622831997be"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1802.02056",
    "kind": "arxiv",
    "version": 1
  }
}