References 385% CONFIDENCEOverall confidence: 85%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 at 75% confidence or better
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]90%youtube.com/watch?v=h1NDO0d-4MMyoutube.com· Posted Sep 15, 2026· Starts Jul 19, 1900 ✓· 33% of score
RATP's[3] own history page gives 19 July 1900 as the inauguration date of the first métro line; EarthSky's[2] science-history article gives June 19, 1900, a month early.
- [2]78%This date in science: Paris Metro begins operations - EarthSkyearthsky.org· Added Sep 15, 2026· 33% of score
Independent science-history article corroborating the 19 July 1900 opening.[1]
- [3]88%Metro line 1: a line and its history - RATPratp.fr· Added Sep 15, 2026· 33% of score
RATP's own history page for line 1 gives the 19 July 1900 inauguration date.
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