Silbury Hill

UK20210521_A

21 May 2021·Silbury Hill, Wiltshire·oilseed rape

aerial of Silbury Hill — **Hugh Newman | crop circles from the air** (image credit) · aerial published by cropcirclecenter.com — crop circle in Silbury Hill | May 21 2021. One of 3 images on this record.

diagram of Silbury Hill — **Hugh Newman | crop circles from the air** (image credit) · aerial published by cropcirclecenter.com — crop circle in Silbury Hill | May 21 2021. One of 3 images on this record.

Reported 21 May 2021 in oilseed rape at Silbury Hill, Wiltshire. One archive recorded it, so nothing about it can be cross-checked.

The record

date: 21 May 2021 (day precision)
place: Silbury Hill
Wiltshire
England
crop: oilseed rape
size: not recorded
recorded by: cc
images: 3 · 2 diagram, 1 aerial
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: 51.415755, -1.857405
how it was got: os open names
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

3 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 (2)

diagram cropcirclecenter.com / Bertold Zugelder site default

site	kind	credit	basis	caption	size	file	source page
cc	diagram	cropcirclecenter.com / Bertold Zugelder	site default	crop circle in Silbury Hill \| May 21 2021	575×415 84.1 KiB image/jpeg	image f87e41b657b4	https://www.cropcirclecenter.com/ccdata/2021/05/21/UK20210521_A.html
cc	diagram	cropcirclecenter.com / Bertold Zugelder	site default	crop circle at Silbury Hill \| May 21 2021	575×415 84.1 KiB image/jpeg	image f87e41b657b4	https://www.cropcirclecenter.com/date/2021/202105.html

site

kind

credit

basis

caption

size

file

source page

diagram

cropcirclecenter.com / Bertold Zugelder

site default

crop circle in Silbury Hill | May 21 2021

575×415
84.1 KiB image/jpeg

image f87e41b657b4

https://www.cropcirclecenter.com/ccdata/2021/05/21/UK20210521_A.html

diagram

cropcirclecenter.com / Bertold Zugelder

site default

crop circle at Silbury Hill | May 21 2021

575×415
84.1 KiB image/jpeg

image f87e41b657b4

https://www.cropcirclecenter.com/date/2021/202105.html

Photographs (1)

aerial Hugh Newman | crop circles from the air image credit

site	kind	credit	basis	caption	size	file	source page
cc	aerial	Hugh Newman \| crop circles from the air	image credit	crop circle in Silbury Hill \| May 21 2021	575×415 366.7 KiB image/jpeg	image 2ff9fd1d60c6	https://www.cropcirclecenter.com/ccdata/2021/05/21/UK20210521_A.html

site

kind

credit

basis

caption

size

file

source page

aerial

Hugh Newman | crop circles from the air

image credit

crop circle in Silbury Hill | May 21 2021

575×415
366.7 KiB image/jpeg

image 2ff9fd1d60c6

https://www.cropcirclecenter.com/ccdata/2021/05/21/UK20210521_A.html

Date

21 May 2021, to day precision. What a source records is the day a formation was found and reported.

reported by: cc: 21 May 2021
weekday: Friday, day 141 of the year, ISO week 20, spring
sun and moon: 30.6 days before the June solstice; moon waxing gibbous (68% lit), 5.0 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: 51.415755, -1.857405 — place, ±2,000 m, by os_open_names, from the cc record
on a map: OpenStreetMap

site	place	county	country	grid ref	what3words	fix
cc		Wiltshire	England			51.415755, -1.857405 place / os_open_names

site

place

county

country

grid ref

what3words

fix

Wiltshire

England

51.415755, -1.857405 place / os_open_names

Crop and size

crop: oilseed rape (cc: oilseed rape)
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 UK20210521_A

name Silbury Hill

location

county Wiltshire

country England

date reported 2021-05-21

date precision day

crop oilseed rape

size

diameter (ft)

grid reference

what3words

map link

credits Hugh Newman | crop circles from the air, cropcirclecenter.com / Bertold Zugelder

source page https://www.cropcirclecenter.com/date/2021/202105.html

link to the entity singleton
decided by none on 2026-09-11

warnings none

record cc/b4cda46f1c711…
raw record view: /formation/cc/b4cda46f1c711bc50e40d92228bd6ff0ebf0601e99f018cb8cfbff8f95a7464a in the preview app

field	cc cropcirclecenter.com
id / slug	UK20210521_A
name	Silbury Hill
location
county	Wiltshire
country	England
date reported	2021-05-21
date precision	day
crop	oilseed rape
size
diameter (ft)
grid reference
what3words
map link
credits	Hugh Newman \| crop circles from the air, cropcirclecenter.com / Bertold Zugelder
source page	https://www.cropcirclecenter.com/date/2021/202105.html
link to the entity	singleton decided by none on 2026-09-11
warnings	none
record	cc/b4cda46f1c711… raw record view: `/formation/cc/b4cda46f1c711bc50e40d92228bd6ff0ebf0601e99f018cb8cfbff8f95a7464a` 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

2 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 f87e41b6	≈ none found	7	3	0.974	0.0829

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 f87e41b6— 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: Broad Hinton 18 May 2021, Broad Hinton
next: Crawley Down 8 June 2021, Crawley Down
previous in UK: Broad Hinton 18 May 2021
next in UK: Crawley Down 8 June 2021
same day: no other formation is dated this day
within 7 days and 25 km: Broad Hinton 18 May 2021, 8.3 km away, 3 day(s) apart

In place

The nearest formations the archive can place.

Silbury Hill15 July 1988
Silbury Hill
0 m away, 1988-07-15

Silbury Hill26 July 1988
Silbury Hill
0 m away, 1988-07-26

Silbury Hill30 July 1988
Silbury Hill
0 m away, 1988-07-30

Silbury Hill10 May 1989
Silbury Hill
0 m away, 1989-05-10

Silbury Hill23 June 1989
Silbury Hill
0 m away, 1989-06-23

Silbury Hill28 June 1989
Silbury Hill
0 m away, 1989-06-28

same county and year: Stanton St Bernard 10 May 2021 · Broad Hinton 18 May 2021 · Wotten Rivers 8 June 2021 · Ludgershall 14 June 2021 · Hackpen Hill 15 June 2021 · Tidcombe Down 28 June 2021 · Avebury Stone Circle 2 July 2021 · Hackpen Hill 5 July 2021 · Marten 8 August 2021 · Roundway Hill 15 August 2021

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/UK20210521_A.json · row in index/manifest.jsonl
input digests: entity 31358f4ae309 · images f5c630e8ebf9 · texts 4f53cda18c2b · geo 951a6af19c3c