The Great Comet of 1811
What happened
An exceptionally spectacular comet remained visible to the naked eye for over 260 days, observed with profound awe across Moscow and the Russian Empire. Its immense size and eerie brilliance coincided with Napoleon's fateful invasion of Russia. The Russian populace widely interpreted the comet as a direct celestial warning of apocalyptic warfare, immense suffering, and the ultimate destruction of the invading French forces, fostering an intense wave of religious nationalism.
Literary impact
This legendary comet is immortalized by Leo Tolstoy in his epic 'War and Peace', where Pierre Bezukhov gazes at it as a symbol of a new life. It also deeply influenced the dark, ominous atmospheres found in the poetry of Russian Romantic writers like Alexander Pushkin.
Source: Wikipedia