Japanese monks and emperors kept meticulous records of cherry blossom festivals for 1,200 years. They accidentally built the world's longest climate dataset

https://sh.itjust.works/post/57803561

It’s there a difference in tone or meaning between accidentally and inadvertently? I feel like accidentally means they did something that was a bad thing.
Accidents don’t have to be bad? Accident means just “not on purpose” it has no connotation either way

Right. When someone is accused of something, and they say “But it was an accident!”, that’s exactly what it means.

But if you shit yourself and say “I had an accident.”, that’s not what it means. Or you call your parents and say, “I was in an accident.”

It has different connotations and in this case I’m conflicted, and therefore I would’ve chosen a different word.

I had an inadvertent!