CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins95% CONFIDENCEOverall confidence: 95%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 at 75% confidence or better
The cited source explicitly dates this event; the pin records the stated calendar day.[1]Unit 1 begins commercial operation on Three Mile Island in Pennsylvania, following construction that began in 1968.
$400M
1.00