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How do astronomers measure distance to the moon?

Answer 1

Many methods were used before Radar signals were also used.

Now the retro reflectors left on Moon by Apollo astronauts is used to measure the Moon distance accurately to one centimeter. Laser beams are send from observatories and reflected back and time is measured From this distance is calculated,

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Answer 2

Levi Alexander

Many techniques are used by astronomers to calculate the distance to the Moon, such as triangulation with data from spacecraft or Earth-based telescopes, laser ranging, and radar ranging.

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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.