References 265% CONFIDENCEOverall confidence: 65%How well the pin's source and references back up its dates.Weighted average of how firmly 2 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidence
The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
- [1]50%eso.org/public/announcements/ann25001eso.org· Posted Sep 21, 2026· Starts Mar 31, 2029 ✓· 50% of score
ESO[2] states the ELT "is now set to make its first test observations at the beginning of 2029, with 'telescope first light' expected in March 2029". Only the month is given, so the pin takes its last day.
- [2]85%Timeline - ELT - ESOelt.eso.org· Added Sep 21, 2026· 50% of score
The project's own timeline page.[1]
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