The Great Comet of 1861: When Earth Grazed a Comet’s Tail

The Great Comet of 1861 stunned the world as Earth passed through its tail. Discover how a farmer-astronomer and Civil War witnesses saw history.

Donati’s Comet 1858: The Comet That Stunned the World

Explore Donati’s Comet of 1858—its historic observations, first photographs, and global impact, from Florence skies to Abraham Lincoln’s gaze.