Corrections
Updated
An instrument that reads wrong gets recalibrated, and its log says so. This is that log: every substantive correction to a page on The What-If Observatory, newest first.
How corrections work
Anything that changes a fact, a number, a grade or a Seeing rating is recorded here. None of those changes is made silently.
Each entry is one list item in this form, with the page title linked:
YYYY-MM-DD — Page title: what was wrong → what it says now. Reported by a reader / found on recheck. Seeing changed: from → to (if it changed).
The same entry goes at the foot of the corrected page on the same day, and the revision date in its Cite this page block moves with it.
A correction reaches every place the claim appears: the short answer, the Suppose and Hold fixed lines, the forecast or utopia card, the Check my math table, the CSV, figures and captions, the page description, and any other page that repeats it.
To report an error, see Contact. How readings are rated is on How We Rate a Reading.
Log
No corrections have been recorded as of 2026-11-09.