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I live in London and I have my location set to Recife, Brazil. That way I get 'sunset' around 9pm in the winter - late enough to let me continue working on a bright screen, but early enough to not blast blue light before going to bed.

The point for me is not so much matching the environment but not staring at a blue screen right before bed.

I find the same thing from Canada. Perhaps I'll try telling it I'm at a more equatorial location.

Seems like a simple fix to make it latitude-aware, if it's not already.