Calvert
US19731211_A11 December 1973·Calvert·grass
Reported 11 December 1973 in grass at Calvert. One archive recorded it, so nothing about it can be cross-checked.
The record
- date
- 11 December 1973 (day precision)
- place
- Calvert
United States - crop
- grass
- size
- 29 ft (8.8 m) across
as written: 6 x 9 m | 19 x 29 ft - 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
- 30.977970, -96.673860
- 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 no diagram published by cropcirclecenter (plain circle placeholder) |
cropcirclecenter.com / Bertold Zugelder | site default | 575×415 32.5 KiB image/jpeg |
image 540997e43c34 | https://www.cropcirclecenter.com/date/1973/197312.html |
Date
11 December 1973, to day precision. What a source records is the day a formation was found and reported.
- reported by
- cc: 11 December 1973
- weekday
- Tuesday, day 345 of the year, ISO week 50, winter
- sun and moon
- 10.5 days before the December solstice; moon waning gibbous (97% lit), 1.4 days after 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
- 30.977970, -96.673860 — place, ±2,000 m, by geonames, from the cc record
- on a map
- OpenStreetMap
| site | place | county | country | grid ref | what3words | fix |
|---|---|---|---|---|---|---|
| cc | Texas | United States | 30.977970, -96.673860 place / geonames |
Crop and size
- crop
- grass (cc: reed grass)
- diameter
- 29 ft (8.8 m)
- size as written
- 6 x 9 m | 19 x 29 ft
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 | US19731211_A |
| name | Calvert |
| location | |
| county | Texas |
| country | United States |
| date reported | 1973-12-11 |
| date precision | day |
| crop | reed grass |
| size | 6 x 9 m | 19 x 29 ft |
| diameter (ft) | 29 |
| grid reference | |
| what3words | |
| map link | |
| credits | cropcirclecenter.com / Bertold Zugelder |
| source page | https://www.cropcirclecenter.com/date/1973/197312.html |
| link to the entity | singleton decided by none on 2026-09-11 |
| warnings | no_formation_page |
| record | cc/b5f30163a7cc0… raw record view: /formation/cc/b5f30163a7cc0d367f834ad56815f08cb76b5f708f64cd08470d91d627040608 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 540997e4 (placeholder: digest) | ≈ continuous (concentric circles) | 1 | 1 | 0.996 | 1.0049 |
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 540997e4— 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
- Bordertown 8 December 1973, Bordertown
- next
- Wentworth Falls 25 December 1973, Wentworth Falls
- previous in US
- San Diego 11 November 1973
- next in US
- High Point 23 March 1974
- 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.
Houston14 September 1972Houston
184.5 km away, 1972-09-14
HeartlandJune 1996Heartland
191.5 km away, 1996-06 Carrollton1960
Carrollton
220.6 km away, 1960 Grapevine4 May 1974
Grapevine
220.8 km away, 1974-05-04 Shreveport1 June 2003
Shreveport
325.6 km away, 2003-06-01
Tilden15 July 2004Tilden
333.3 km away, 2004-07-15
- 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/US19731211_A.json · row in index/manifest.jsonl
- input digests
- entity 2a170ceb9e16 · images a3e534cc7fe9 · texts 4f53cda18c2b · geo db2600789528