OpenTwo archives, queried live.
Every record below comes from The Met or Smithsonian Open Access and was filtered on that archive’s own rights field before it reached this page. 15 shown for “Regiomontanus” — 24 records examined, 4 dropped by the rights gate.
Archives queried 2026-08-27 21:35 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Astrolabe
Regiomontanus · 1462
Cyperus regiomontanus Britton
Artist not stated in the record · 3 Oct 1936
Sphaera Mundi
Johannes de Sacrobosco (John Holybush) · 1485
Cyperus regiomontanus Britton
Artist not stated in the record · 3 Oct 1936
Automaton clock in the form of Urania, Muse of Astronomy
Paullus Schiller · ca. 1620–30
Cyperus regiomontanus Britton
Artist not stated in the record · Jul 1890
Cyperus regiomontanus Britton
Artist not stated in the record · 1903
Cyperus regiomontanus Britton
Artist not stated in the record · Transcribed d/m/y: 23/7/98
Cyperus regiomontanus Britton
Artist not stated in the record · 10 Aug 1984
Cyperus regiomontanus Britton
Artist not stated in the record · Jun 1938
Cyperus regiomontanus Britton
Artist not stated in the record · 1 Oct 1925
Cyperus regiomontanus Britton
Artist not stated in the record · 21 Oct 1925
Cyperus regiomontanus Britton
Artist not stated in the record · 5 Jul 1965
Cyperus regiomontanus Britton
Artist not stated in the record · 4 Jun 1938 to 7 Jun 1938
Astragalus regiomontanus Barneby
Artist not stated in the record · 22 Aug 1889
Where these records came from.
Two archives are wired, and only two. Each one is filtered on its own rights field — never on a title match, and never on the presence of an image file.
- The Met Collection API (Open Access)Rights field:
isPublicDomain. 3 matched · 3 examined · 0 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.3 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 21 matched · 21 examined · 4 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.12 shown
These figures describe the pass run at 2026-08-27 21:35 UTC, during this request. A completed pass is kept for 24 hours and replayed for an identical search, which is what keeps repeated queries inside Smithsonian’s 30-requests-per-hour allowance. A pass in which either archive failed to answer is never kept — an outage must not be replayed as though it were a finding about the catalogue.
Wikimedia Commons and the Library of Congress are deliberately not wired. Wikimedia was confirmed, on a live query, to return CC-BY material inside the same result set as genuine public domain works, and filtering it safely has not been designed yet. loc.gov was blocked by bot detection during the source evaluation, so its rights vocabulary has never been observed — and nothing here is built on a field nobody has read.
An image file is a rights claim. It never travels without its field.