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tatiyna
3 years ago
6

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

Geography
1 answer:
Temka [501]3 years ago
5 0

Answer:

  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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