On 14 September 2015, the LIGO detectors in Louisiana and Washington State captured the first direct observation of gravitational waves, ripples in space-time predicted by Einstein a century earlier. The signal came from two black holes colliding 1.3 billion light-years away, their merger converting three solar masses into pure energy. The detection confirmed General Relativity, opened gravitational wave astronomy, and earned its discoverers the 2017 Nobel Prize in Physics. Meanwhile, 14 September 1752 marked Britain’s chaotic adoption of the Gregorian calendar after 170 years of resistance. To realign with Europe, Parliament skipped eleven days: 2 September was followed directly by 14 September. Though popular legend claims riots erupted over the missing days, historians remain sceptical. The administrative confusion, however, was real, as rents, contracts, and schedules had to recalibrate overnight. Two stories about timing: one signal that travelled for over a billion years, and eleven days that simply vanished.