Visibility of a Dyson ring/swarm

There have been several questions about the construction, operation and destruction of a Dyson sphere. I'm interested in something a bit less exciting: how far out can you still see it from?

Assume it is not habited and exists purely for collecting energy. Also disregard telescopes.

My civilization is a little... primitive. Not too advanced and not exactly aware that their ancestors traveled the stars. They're also easily excited and quick to jump to conclusions. I'd imagine a visible alien megastructure enveloping their source of life would be a topic for conversation, even if it is completely incomprehensible to them.

I've read that one can see sunspots with the naked eye. Supposedly they played a part in ancient Chinese astrology. I've also read that a Dyson cloud would alter the light emitted by the star but it would most likely be too small to be noticed on Earth.

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Visibility of a Dyson ring/swarm

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