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.
Happened as dated, per the source: "the Sydney Opera House was officially opened by Queen Elizabeth II."
Opened primary project source for sourced buildout metrics and project timeline; researched 2026-10-29.[1]
Final cost A$102m (figure in 1973 dollars, not inflation adjusted).[1]
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