Spring equinox alignments—not just Stonehenge, what about lesser-known sites?

So everyone knows about Stonehenge's solstice/equinox alignment, but Britain's got loads of other ancient sites that seem to have astronomical significance. Newgrange in Ireland, the standing stones in Orkney, even some smaller sites in Wales that seem to track lunar cycles.

The question I keep coming back to: did all these ancient peoples independently figure out precise astronomical alignments, or were they taught by someone/something? And if they did figure it out independently, what does that tell us about ancient knowledge?

I'm not going full ancient astronaut theory here, but I am genuinely puzzled by how consistent the alignments are across different cultures and time periods. Any archaeologists or actual astronomers in the community with thoughts?

It's not actually that mysterious when you think about it. If you're living in an agricultural society, tracking seasons is literally survival. You need to know when to plant. So of course you'd pay attention to the sky - every culture does. The fact that the alignments are 'consistent' is because they're tracking the same physical phenomenon (the sun's position at solstices). It's convergent problem-solving, not evidence of ancient visitors or hidden knowledge.

That's a fair point, but it doesn't explain the *precision* of some alignments. Newgrange aligns to the winter solstice sunrise within a matter of metres when it's hundreds of metres long. That's not guesswork - that's sophisticated astronomical knowledge. How did they achieve that accuracy without telescopes?

did all these ancient peoples independently figure out precise astronomical alignments, or were they taught by someone/something?

Occam's razor: they figured it out independently because they were clever. They had all the time in the world to study the sky (no light pollution, no Netflix), and they had strong motivation (survival). Over generations, you'd develop accurate knowledge. Doesn't need aliens or lost super-civilisations - just patience and observation.

I'd be more interested in the *why* beyond agriculture. Yes, tracking seasons is practical. But why build monuments? Why align them so precisely? There's probably a religious or spiritual component that's now lost. That's the interesting bit, not whether aliens helped them.

There's also evidence that some of these sites were aligned to stellar positions that have shifted due to precession. If you account for precession, some alignments become even more precise. Which suggests incredibly long-term tracking of the sky - measuring changes over centuries. That's proper science, not magic.