What factor causes the specific recommended viewing time (e.g., pre-dawn east vs. post-sunset west) to vary regionally for Comet 3I/ATLAS?
Answer
The observer's location on Earth dictating the orbital path relative to their horizon
The variability in local advice, such as whether to look east before dawn or west after twilight, underscores that the observer's geographical position on Earth dictated when they could best look for the comet based on its orbital path.

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