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9 January, 03:56

Why is it better for astronomers to measure parallax by observing every six months instead of observing every year

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  1. 9 January, 07:01
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    The baseline is longer

    Explanation:

    Each year, the Earth is in the same place relative to the sun, give or take a quarter million miles. Hence the sky pretty much appears the same.

    In 6 months, the Earth is about 2 AU (about 186 million miles) from where it was, so the baseline for observing parallax is much longer.

    The longer the baseline, the better, when measuring parallax.
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