Aikawa
JP19910415_A15 April 1991·Aikawa
Reported 15 April 1991 at Aikawa. One archive recorded it, so nothing about it can be cross-checked.
The record
- date
- 15 April 1991 (day precision)
- place
- Aikawa
Japan - crop
- not recorded by any source
- 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
- 35.397257, 139.439357
- how it was got
- county centroid
county, to within 30,682 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 42.5 KiB image/jpeg |
image 23ba0e94d83c | https://www.cropcirclecenter.com/date/1991/199104.html |
Date
15 April 1991, to day precision. What a source records is the day a formation was found and reported.
- reported by
- cc: 15 April 1991
- weekday
- Monday, day 105 of the year, ISO week 16, spring
- sun and moon
- 25.4 days after the March equinox; moon new (1% lit), 13.4 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
- 35.397257, 139.439357 — county, ±30,682 m, by county_centroid, from the cc record
- on a map
- OpenStreetMap
| site | place | county | country | grid ref | what3words | fix |
|---|---|---|---|---|---|---|
| cc | Kanagawa | Japan | 35.397257, 139.439357 county / county_centroid |
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 | JP19910415_A |
| name | Aikawa |
| location | |
| county | Kanagawa |
| country | Japan |
| date reported | 1991-04-15 |
| date precision | day |
| crop | |
| size | |
| diameter (ft) | |
| grid reference | |
| what3words | |
| map link | |
| credits | cropcirclecenter.com / Bertold Zugelder |
| source page | https://www.cropcirclecenter.com/date/1991/199104.html |
| link to the entity | singleton decided by none on 2026-09-11 |
| warnings | no_formation_page |
| record | cc/a3cc77cfe9ada… raw record view: /formation/cc/a3cc77cfe9ada3278386b0b26318266d78c24250d9b73ef828f44215c4d338b9 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 23ba0e94 | ≈ continuous (concentric circles) | 1 | 1 | 0.996 | 0.2912 |
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 23ba0e94— 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
- Alton Barnes April 1991, Alton Barnes
- next
- Alton Barnes 18 April 1991, Alton Barnes
- previous in JP
- JP19910133_A January 1991
- next in JP
- Inami 2 June 1991
- same day
- Aikawa (Aikawa)
- 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.
this formation has no coordinate at place confidence or better, so nothing can be called near it
- 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/JP19910415_A.json · row in index/manifest.jsonl
- input digests
- entity 93e54c963ba8 · images f4ec648f3f4b · texts 4f53cda18c2b · geo 3c31275e6993