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.
Date has moved, per the source: "telescope first light" is "now planned for March 2029," after "several of the telescope contracts suffered delays."
ESO's[3] own project timeline page confirms 'the ELT is set to make its first test observations in 2029,' consistent with the pin's stored March 2029 date, with scientific first light targeted for December 2030.
ESO's[2] own announcement confirms telescope first light is 'expected in March 2029' - an exact match for the pin's stored date - with full scientific first light following in December 2030.
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most. A picture that shows something else, or shows it badly, is looked at too, and moved down or replaced.