What makes stellar parallax easier to observe?

Answer 1

Because when readings are taken at two different times, simple geometry allows for the calculation #a^2 + b^2 = c^2#

The stellar parallax is good but is limited. For astronomers to make their calculation the measured angle can be no less than 1 arc second.

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Answer 2

Josiah Adams

Larger baselines make observing stellar parallax easier. For example, if two points are farther apart, the star can be observed from both ends of Earth's orbit around the Sun, which yields a baseline of about two astronomical units (AU). Accurate measurements of stellar parallax have also been made possible by advances in telescopic technology and precision instruments.

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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.