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What is a parsec and why does it rely on an arcsecond?

Answer 1

Parsec is unit of distance used in astronomy.It is 3.26 l9ight years.

Arc second is an angular measurement While measuring parallax of a star to find distance there is a relation between ditance and parallax in arc seconds

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Answer 2

Ariana Acosta

The term "parallax of one arcsecond" refers to the length unit used in astronomy to measure large distances to objects outside of the Solar System. An arcsecond is based on the angular size of the parallax shift observed from Earth's orbit over a period of six months, due to the Earth's motion around the Sun. The distance at which an object would have a parallax angle of one arcsecond, given the baseline of one astronomical unit (AU), becomes the parsec.

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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.