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

Answer 1

When you measure parallax, you use a baseline.

At the ends of the baseline you measure angles that are VERY close to 90 degrees. The difference between them is called the parallax. Now, the longer the baseline, the larger the parallax for a certain distance. Earth-bound parallax uses the two extremes of the Earth's orbit as a baseline. The orbit of Ceres is much larger that that of Earth, so it would give better readings.

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Answer 2

Levi Alexander

No, it wouldn't be simpler to measure a star's parallax from Ceres; in fact, the accuracy of parallax measurement is improved by the larger baseline on Earth.

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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.