How do astronomers use parallax to study stars?

Answer 1

parallax measurement ![enter image source here]

Image result for parallax angle: parallax is defined as the angle or semi-angle of inclination between two lines of sight. It is the displacement or difference in the apparent position of an object when viewed along those two lines. This image was found on astronomy online.com.

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Answer 2

Josiah Adams

The apparent shift in a star's position as observed from various points in Earth's orbit around the Sun is measured by astronomers using a technique called stellar parallax. By comparing a star's position against that of more distant background stars, astronomers can determine the star's distance from Earth. This technique is essential for figuring out how far away stars are from Earth and for producing precise maps of the Milky Way galaxy.

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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.