Which limitation inherently affected the observation accuracy of early astronomical instruments utilising naked-eye observations of celestial objects?

💡 Explanation

When early astronomers relied on naked-eye observations alongside devices like quadrants, subjective judgement in determining precise alignments became the limiting factor, because human vision involves inherent variability and parallax issues, reducing precision. Therefore, observer bias most directly impacts sighting accuracy, whereas external effects or gradual mechanical errors were generally manageable.

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