Pith Number

pith:Z55C56ML

pith:2017:Z55C56MLY6SUIUAVETPVKWIKNY

not attested not anchored not stored refs pending

Street lights as standard candles: A student activity for understanding astronomical distance measurements

Markus P\"ossel

arxiv:1702.02391 v1 · 2017-02-08 · physics.ed-ph · astro-ph.IM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Z55C56MLY6SUIUAVETPVKWIKNY}

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	2026-05-18T00:51:06.033673Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cf7a2ef98bc7a544501524df55590a6e34b6d2f667f2e0f8e392aad7f3e64e05

Aliases

arxiv: 1702.02391 · arxiv_version: 1702.02391v1 · doi: 10.48550/arxiv.1702.02391 · pith_short_12: Z55C56MLY6SU · pith_short_16: Z55C56MLY6SUIUAV · pith_short_8: Z55C56ML

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/Z55C56MLY6SUIUAVETPVKWIKNY \
  | 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: cf7a2ef98bc7a544501524df55590a6e34b6d2f667f2e0f8e392aad7f3e64e05

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ba38663ba8bc599641f06bcc571a3f2a447d860a9ff54214f222bc3ae19ba54b",
    "cross_cats_sorted": [
      "astro-ph.IM"
    ],
    "license": "http://creativecommons.org/licenses/by-sa/4.0/",
    "primary_cat": "physics.ed-ph",
    "submitted_at": "2017-02-08T12:11:52Z",
    "title_canon_sha256": "e7e4e96096af7025ad9f4ac3ce0be895e91fc684006be1ea4bed5d0f56f6f515"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1702.02391",
    "kind": "arxiv",
    "version": 1
  }
}