> Edison's observation of gravitational lensing during an eclipse There may have been electric lights and phonographs on the ships, but it was the https://en.

> Edison's observation of gravitational lensing during an eclipse There may have been electric lights and phonographs on the ships, but it was the https://en.wikipedia.org/wiki/Eddington_experiment https://en.wikipedia.org/wiki/Eddington_experiment and while maybe you could say it was about gravitational lensing, the observatories (and Earth) was so far from any possible caustic that it's better to leave it at just deflection of light. Here's a pop-sci treatment of the gravitational lensing of our sun for astronomy -- tl;dr it involves lonnnnng distance travel, more than 500 astronomical units (Pluto is at ~ 30-50 au). https://blogs.scientificamerican.com/observations/using-the-sun-as-a-cosmic-telescope/ https://blogs.scientificamerican.com/observations/using-the-...