4 September

4 September 1752 was the second day purchased by Faction Paradox through the Gregorian Compact for their Eleven-Day Empire. (PROSE: Interference, The Book of the War)

In 1878 in an alternative timeline, the British Imperial Spacefleet continued its journey towards the Moon. (PROSE:  Imperial Moon)

In 4,500,000,025, Feline sapiens were recognised as a sentient species and keeping them as pets was made illegal. (PROSE: Time Traveller's Diary)