Amsterdam
NL19970118_A18 January 1997·Amsterdam·grass
Reported 18 January 1997 in grass at Amsterdam. One archive recorded it, so nothing about it can be cross-checked.
The record
- date
- 18 January 1997 (day precision)
- place
- Amsterdam
The Netherlands - crop
- grass
- size
- not recorded
- recorded by
- cc
- images
- 1 · 1 diagram
- writing
- nothing was written about this formation on any source
Also called
Nothing else. No other name or place string appears on any source record for this formation.
Where exactly
- coordinate
- 52.374030, 4.889690
- 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 same file as tt |
diagram no diagram published by cropcirclecenter (“no diagram” tile) |
cropcirclecenter.com / Bertold Zugelder | site default | 575×415 66.1 KiB image/jpeg |
image 3461dff5df5d | https://www.cropcirclecenter.com/date/1997/199701.html |
Date
18 January 1997, to day precision. What a source records is the day a formation was found and reported.
- reported by
- cc: 18 January 1997
- weekday
- Saturday, day 18 of the year, ISO week 3, winter
- sun and moon
- 27.9 days after the December solstice; moon waxing gibbous (77% lit), 5.1 days before the full moon (computed at 12:00 UTC; a reported date is a discovery date, not a creation date)
Place
What each source printed, and the coordinate derived from it. No source in this archive publishes a coordinate of its own.
- coordinate
- 52.374030, 4.889690 — place, ±2,000 m, by geonames, from the cc record
- on a map
- OpenStreetMap
| site | place | county | country | grid ref | what3words | fix |
|---|---|---|---|---|---|---|
| cc | Noord-Holland | The Netherlands | 52.374030, 4.889690 place / geonames |
Crop and size
- crop
- grass (cc: grass)
- diameter
- not recorded by any source
- size as written
- not recorded
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 | NL19970118_A |
| name | Amsterdam |
| location | |
| county | Noord-Holland |
| country | The Netherlands |
| date reported | 1997-01-18 |
| date precision | day |
| crop | grass |
| size | |
| diameter (ft) | |
| grid reference | |
| what3words | |
| map link | |
| credits | cropcirclecenter.com / Bertold Zugelder |
| source page | https://www.cropcirclecenter.com/date/1997/199701.html |
| link to the entity | singleton decided by none on 2026-09-11 |
| warnings | no_formation_page |
| record | cc/97a0be650233d… raw record view: /formation/cc/97a0be650233d9d042e0cabfb3d935e94eca116b005f2990f83b89b36e7776db 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, of which 1 is a shared cropcirclecenter placeholder rather than a drawing of this formation. 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 3461dff5 (placeholder: digest) | ≈ 2-fold score 0.906 | 4 | 3 | 0.853 | 0.3434 |
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 3461dff5— 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
- The Hermit January 1997, The Hermit
- next
- Cessnock February 1997, Cessnock
- previous in NL
- Wilhelminadorp 1997
- next in NL
- Hoeven February 1997
- same day
- no other formation is dated this day
- 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.
Schiphol31 July 1997Schiphol
10.8 km away, 1997-07-31
Schiphol16 May 2008Schiphol
10.8 km away, 2008-05-16 Purmerend30 July 1997
Purmerend
15.3 km away, 1997-07-30 Aalsmeer1994
Aalsmeer
15.5 km away, 1994
Hoofddorp1990Hoofddorp
15.8 km away, 1990
Loosdrecht1 June 2002Loosdrecht
21.3 km away, 2002-06-01
- 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/NL19970118_A.json · row in index/manifest.jsonl
- input digests
- entity 9e5a210f5b37 · images cde4d9495e39 · texts 4f53cda18c2b · geo 4e48ac895f77