Would it be easier to measure a stars parallax from Neptune? Why?

Answer 1

It would be far easier.

Parallax measuring involves measuring small angular differnces from both sides of a base. The longer the base, the better the measurement. Earth based measurements can use the extremes of the Earth's orbit as a base, some 300 million km. Using Neptune's extremes of orbit, this would create a base of about 8 billion km, this is almost 27 times as wide.

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Answer 2

Luca de

Certainly, because Neptune's orbit is farther from the Sun than Earth's is, it would be simpler to measure a star's parallax from Neptune because there would be a larger baseline.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.