A solar eclipse in India in 1868 proved instrumental in the eventual discovery of helium. Astronomer Pierre Jules Janssen first observed a unique yellow spectral line during the eclipse, but its meaning remained unclear. Norman Lockyer subsequently identified the line as belonging to a new element, which he named helium. For over two decades, helium remained a hypothesized element only found in the sun. It wasn’t until 1895 that William Ramsay isolated helium on Earth from a mineral sample, validating Janssen's earlier observations of solar prominences and pioneering spectroscopic methods. This discovery highlights the importance of observing celestial events for terrestrial scientific progress.