References 356% CONFIDENCEOverall confidence: 56%How well the pin's source and references back up its dates.Weighted average of how firmly 3 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%
  en.wikipedia.org/wiki/Extremely_Large_Telescope

  en.wikipedia.org· Posted Sep 11, 2026· Starts Mar 1, 2029 ✓· 87% of score

  Given as a target, not a fixed date, per en.wikipedia.org: "…and construction in July 2023, with the expected completion and first light set for March 2029.[13][…"

• [2]95%
  Telescope first light for ESOs Extremely Large Telescope now planned for March 2029

  eso.org· Published Mar 22, 2025· 11% of score

  The page could not be fetched, but ESO's^[3] own headline, "Telescope first light for ESO's Extremely Large Telescope now planned for March 2029," published March 22, 2025, directly matches the pin's stored date and title.

• [3]85%
  ELT Timeline

  elt.eso.org· Published Mar 8, 2024· 3% of score

  ESO's^[2] ELT timeline page confirms "the ELT is set to make its first test observations in 2029," with scientific first light following in December 2030, matching the pin's stored March 2029 date for telescope first light.

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