Solar eclipse
From Tardis Wiki, the free Doctor Who reference
When Tycho Brahe was fourteen, he witnessed a solar eclipse in Denmark. The fact that it was predicted inspired Brahe to become an astronomer. (COMIC: Herald of Madness)
The Tenth Doctor watched a solar eclipse in the Arctic in 2019. He found it was beautiful. (COMIC: Arctic Eclipse)
In 2400, the Daleks planned to use a solar eclipse in a plan to destroy Earth, but were defeated. (COMIC: Battle for the Moon)