Transit Observation
- When
- 9 December 1874
- Where
- Japan (no exact site named; outside allowed places)
Janssen observed the 1874 transit of Venus in Japan, the event the Passage de Vénus photographs are associated with.
Janssen successfully observed the 1874 transit of Venus in Japan. The transit occurred on 9 December 1874 (01:49 to 06:26 UTC), providing an opportunity for improved measurements. Passage de Vénus is a series of photographs of this transit, purportedly taken by Janssen with his photographic revolver, though extant revolver plates are practice shots with a model. No exact observation site is named in the sources, and Japan is outside the allowed places, so no place name is assigned.
Sources
- Passage de Vénus Wikipedia, revision of 2026-09-20
- Pierre Janssen Wikipedia, revision of 2026-08-12
- 1874 transit of Venus Wikipedia, revision of 2026-06-22
Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.