Reported 1991 at Donderen. One archive recorded it, so nothing about it can be cross-checked.
The record
- date
- 1991 year precision
- place
- Donderen, The Netherlands no other name or place string on any source record · name from the cropcirclecenter.com name
- crop
- not recorded by any source
- size
- not recorded
- recorded by
- cc · cropcirclecenter.com
- images
- 1 · 1 diagram
- writing
- nothing was written about this formation on any source
Where exactly
- coordinate
- 53.095830, 6.545830
- how it was got
- geonames — place, to within 2,000 m, from the cc record
- on a map
- OpenStreetMap
No source publishes a coordinate for any formation in this archive. Every coordinate here is derived from the place name a source printed, and this page says how precise that makes it rather than rounding it away.
Images
1 image(s) on this formation's own source records. Click a tile for the full image; the bytes are fetched when you ask for them and are not stored in this page.
Diagrams (1)
| site | kind | credit | basis | caption | size | file | source page |
|---|---|---|---|---|---|---|---|
| cc | diagram | cropcirclecenter.com / Bertold Zugelder | site default | 575×415 33.4 KiB image/jpeg |
image 75ce6feb07ea | https://www.cropcirclecenter.com/date/1991/1991unk.html |
Date
1991, to year precision. What a source records is the day a formation was found and reported.
- reported by
- cc: 1991
Place
What each source printed, and the coordinate derived from it. No source in this archive publishes a coordinate of its own.
- coordinate
- 53.095830, 6.545830 — place, ±2,000 m, by geonames, from the cc record
- on a map
- OpenStreetMap
| site | place | county | country | grid ref | what3words | fix |
|---|---|---|---|---|---|---|
| cc | Drenthe | The Netherlands | 53.095830, 6.545830 place / geonames |
Crop and size
crop and size not recorded by any source
Source records
What each source published, side by side. A row whose values differ across the sources is marked: the archive prints the disagreement rather than choosing a winner.
| field | cc cropcirclecenter.com |
|---|---|
| id / slug | NL19911333_A |
| name | Donderen |
| location | |
| county | Drenthe |
| country | The Netherlands |
| date reported | 1991 |
| date precision | year |
| crop | |
| size | |
| diameter (ft) | |
| grid reference | |
| what3words | |
| map link | |
| credits | cropcirclecenter.com / Bertold Zugelder |
| source page | https://www.cropcirclecenter.com/date/1991/1991unk.html |
| link to the entity | singleton decided by none on 2026-09-11 |
| warnings | unknown_month; no_formation_page |
| record | cc/b23ce58b1f22c… raw record view: /formation/cc/b23ce58b1f22ca4d5115b3b0a7c5ef29c209f413a07d8e613469dba18d5954e8 in the preview app |
Texts
no text documents in the archive for this formation
Claims about this formation
no claim was extracted from a text about this formation
Geometry
1 diagram file(s) on this page. measured from the diagram itself, and experimental: the extractor's rotational order is right on 88.8 % of a 200-diagram hand-labelled set against a gate of 90 %, so read a number here beside the picture rather than instead of it.
| diagram | rotational symmetry | elements | rings | mirror | fill |
|---|---|---|---|---|---|
| cc 75ce6feb | ≈ 2-fold score 0.993 | 1 | 1 | 0.996 | 0.5337 |
Experimental, and marked ≈ wherever it appears. These numbers are read off a drawing, not off the field: the extractor's rotational order agrees with a hand-labelled set on 88.8 per cent of 200 diagrams against a gate of 90 per cent, its element count is within one on 97.5 per cent, and its ring count is not calibrated at all. Nothing in the analysis tree is derived from the rotational order while that gate is unmet.
Diagrams that look like these: cc 75ce6feb— the nearest by perceptual hash. The whole archive is browsable by shape in the shape section, and this formation's own diagrams go straight into that grid: show them in the grid.
Neighbours
In time
- previous
- Merefa 5 December 1990, Merefa
- next
- Millersburg February 1991, Millersburg
- previous in NL
- Haarlemmermeer 10 August 1990
- next in NL
- Slochteren 1993
- same day
- Ulm (Ulm) · JP19910133_A · Bareham (Bareham) · Amersham (Amersham) · Beckhampton (Beckhampton) · Blackland (Blackland) · Bryn-y-Maen (Bryn-y-Maen) · Bryn-y-Maen (Bryn-y-Maen) · Caernarfon (Caernarfon) · Clench Common (Clench Common) · Clench Common (Clench Common) · Crawley (Crawley) · Crawley (Crawley) · Crawley (Crawley) · Downham Market (Downham Market) · Froxfield (Froxfield) · High Wycombe (High Wycombe) · Longstock (Longstock) · Newhaven (Newhaven) · Sapperton (Sapperton) · South Malling (South Malling) · Sparsholt (Sparsholt) · Sparsholt (Sparsholt) · Steeple Langford (Steeple Langford) · UK19911333_W (Wiltshire) · UK19911333_X (Yorkshire) · UK19911333_Y · US19910101_A · Charles River (Charles River)
- within 7 days and 25 km
- none, or this formation has no coordinate at place confidence or better
In place
The nearest formations the archive can place.
Norg10 August 1994Norg
6.7 km away, 1994-08-10
Assen18 May 1590Assen
11.1 km away, 1590-05-18
Assen28 August 2004Assen
11.1 km away, 2004-08-28
Assen23 July 2010Assen
11.1 km away, 2010-07-23 Witten1994
Witten
12.9 km away, 1994 Witten1996
Witten
12.9 km away, 1996
- same county and year
- none
Provenance
- entity built at
- 2026-09-11T19:20:39Z (derived from the link decisions, not from this build)
- index run ids
- none
- reviews applied
- none
- open queue pairs
- none
- entity record
- index/formations/NL19911333_A.json · row in index/manifest.jsonl
- input digests
- entity 206b5ef3eec4 · images a063227be146 · texts 4f53cda18c2b · geo 866740a02d71