History is obsessed with what happened. But there’s a quieter, stranger story running just beneath the surface: the story of what almost happened on a different date entirely. The moon landing nearly wasn’t July 20, 1969. NASA’s original schedules had Apollo 11 landing closer to July 22nd. Two days. Imagine a world where “one small step for man” was delivered mid-week instead of on a Sunday afternoon, when hundreds of millions of people happened to be at home, near their televisions.

What if you went to sleep on Wednesday and woke up on Thursday — not because you slept through the night, but because Wednesday had been officially cancelled? This is not science fiction. It happened to millions of people in October 1582. When Pope Gregory XIII introduced the Gregorian calendar to correct centuries of drift in the Julian system, ten days were simply deleted. October 4th was followed immediately by October 15th.