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How can the Hubble Constant vary if it is a constant?

Answer 1

Hubble Parameter is often wrongly called as Hubble Constant. It value changes on Cosmological timescales. On human time scales its value does not change in a measurable way, justifying it being called a constant.

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Answer 2

Luca de

Despite its name, the Hubble Constant is subject to variation due to a variety of factors, including disparities in observational data, variations in the universe's expansion rate over time, and variations in measurement techniques.

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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.