Why is a parsec named so?
Parsec is an acronym for 'parallax second'. It is a unit of distance used for measuring distances of deep sky objects. 1 parsec = 3.26156 light year.
Consider an isosceles triangle with equal sides measuring 1 parsec and opposite side 1 AU against an angle of 1 second = 1/3600 degree. A larger unit is mega parsec, or 1 million parsec.
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The term "parsec" was coined to combine the terms "parallax" and "second." Parallax is the apparent shift in an object's position when viewed from different angles, and "second" is a unit of time or angle. A parsec is defined as the distance at which one astronomical unit subtends an angle of one arcsecond due to parallax.
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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.
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.
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.
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.
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