How did Halley know that the comet would come around every 70 odd years, as it's named after him.
Pattern recognition.
I'd love you to elaborate on this.
For example: The train seems to come by every hour, therefore, I predict the train will come by an hour after the one that just came by.
That's fine for an hour or even a day or even a week or month, maybe every year, if it done this regular.
Once every 76 years of a life span around the same time is rather convenient, isn't it?
I think a light in the sky is a little different from a train on the ground, so it's not really relevant in the grand scheme of things.
Because Hailey himself didn't have access to anyone else's data? /s
You pick the stupidest things to try and pick holes in. So easy.
So who stored all this data of this comet? I mean, I thought Halley was the one who discovered it, so what were the others doing? Were they just shouting, "wow look, there's a moving light in the sky somewhere, let's somehow plot it's co-ordinates and map it out explaining what we saw."
The next 76 years someone says, " oh wow, look at that moving light, let's map it out and store it so people can see where it was and what trajectory it's on....wooooo, wait a minute, look at this, I found another map 76 years earlier by someone who's co-ordinates are identical, maybe it's the same thing.....nahhhh, maybe not."
Along comes Halley who says, " wow, look at that light in the sky, I'll map this out and I'll sort it so people can see what it's all about....oh hang on a mo...I've found a few maps here 76 years ago and 76 years before that with the same charts, wow, this is the same light, it obviously comes around every 76 years or so."
What a complete and utter bag of stinking fish guts.