What does mean when scientists say the earth wobbles?

Answer 1

It wobbles like a child's top does but on a longer time scale.

Every 27,000 years the Earth does a kind of wobble, called precession, much like a child's top or a gyroscope. This means that the amount of solar radiation that reaches the northern hemisphere in particular, varies. This wobble is one of three factors related to glacial/interglacial cycles on Earth.

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Answer 2

Olivia Aldridge

Axial precession is the slow, cyclical shift in the Earth's rotational axis; a full cycle of this wobbling movement takes about 26,000 years.

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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.