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Bit of trial and error I guess. I'd start with ISO 400 or 800, close the aperture down a stop or 2 to maybe f/2 or f/2.8 to get the sharpest image although might get some diffraction spikes, and shutter speed will depend on conditions but 30 seconds might be a good starting point. Take many and stack them using the startrails program mentioned above. Don't use auto WB, set it to daylight so there's consistency between shots.
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