Most are familiar with the coordinates for the rings
The first ring has 3 strongholds within 1,408–2,688 blocks of the origin.
The second ring has 6 strongholds within 4,480–5,760 blocks of the origin.
But these are incorrect. Someone misread 48 (32+16) for 40. So all numbers are off by 8*16 blocks. Corrected:
The first ring is 128 +/- 48 chunks out: 1280-2816
The second 320 +/- 48: 4352-5888 and so on
I discovered this when I had multiple seeds with strongholds outside the rings:
Two examples:
SH at -1320 ~ 184-> 1333 from spawn (Seed: -328281714145650574)
SH at -2024 ~ -1848-> 2741 from spawn (Seed: 8416585462644356735)
Source: https://www.reddit.com/r/Minecraft/comments/li3ko6/psa_5_years_later_we_are_still_using_the_wrong/