Janssen traveled to Guntur, India to observe the total solar eclipse of August 18, 1868.
Sources
- How Scientists Discovered Helium, the First Alien Element, 150 Years Ago (smithsonianmag.com)
- https://www.aps.org/apsnews/2014/08/discovery-of-helium-1868 (aps.org)
- https://arxiv.org/pdf/0906.0144 (arxiv.org)
More in History
- Large ships anchored at Texel instead of sailing the 55 miles to Amsterdam because the sandbank called Pampus made Amsterdam's harbor difficult to enter.
- A 130,000-year-old bear bone bears precise, parallel carvings attributed to Neanderthals.
- Ancient Roman concrete, used in structures like the Pantheon, has proven remarkably durable, in part because lime clasts and reactions with seawater form self-healing mineral phases (Al-tobermorite and phillipsite) that reinforce the material over centuries.
- The ruling in Territory of New Mexico v. Yee Shun established the precedent that Asian Americans had the right to testify in court.
- Japan's Basic Act on Environmental Pollution Control was enacted in 1967.
- The Burgzand Noord 17 shipwreck site yielded more than 1,000 artifacts.