18 February

On  1863, the Fifth Doctor and Nyssa continued their investigation into whether Queen Victoria's efforts to contact her beloved Albert had anything to do with the ghost of Adric they'd seen in the TARDIS console room, and the voice of Tremas channelled through the monarch's mystic. (PROSE: Empire of Death)

In 1930, Pluto was discovered, (PROSE: Time Traveller's Diary) although another account dates this to 19 March, 1915. (PROSE: There's a storm coming: 19 March)