Can you please eli5 how Nixon was able to speak to the astronauts on the moon from a landline in the oval office 60 years ago?

Question

Can you please eli5 how Nixon was able to speak to the astronauts on the moon from a landline in the oval office 60 years ago?

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Answer 1

The land line was connected to the Spaceflight Tracking and Data Network, a collection of 15 different locations across the world each with a 30-foot-diameter radio dish pointing at the spacecraft. In addition there were three locations with 85-foot-diameter antennas when the Command Module and Lunar Excursion Module were far from Earth. They communicated using radio waves.