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.
Wikipedia's[2][3] article gives the publication date without hedging - "It was published on 24 November 1859" - and Darwin Online serves the 1859 Murray first edition (F373) that appeared on that day. The date is one of the best-attested in the history of science and no source consulted disputes it.
Gives the publication date, the publisher, the argument of the book and the state of evolutionary thought it entered: "a work of scientific literature by the English naturalist Charles Darwin that is considered to be the foundation of evolutionary biology".[1]
The author's own article, for the twenty years of work between the Beagle voyage and publication and for why he brought the book out when he did; the Royal Society's homepage, cited here before, states nothing about 1859 and was dropped.[1]
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.
Cavendish Laboratory
