Perihelion advance of the earth/moon system (the reality)
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I would normally offer a web based option, but my ability to access my
web pages and internet services generally has been severely diminished.
Why?? In a world so full of bullshit (the universally understood but
not yet in the dictionary word) I can only guess. I am listening
though.
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Download the folder 'periadv' from Google Drive https://drive.google.com/drive/folders/1NM6TxWrYnDzewodnZ-ogGq9-YJFHjVcs?usp=sharing
Unzip the downloaded folder into a directory of your choice. Run the
fbc.htm file. It's a worthwhile adventure on a dull day.
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The advance rate of the earth-moon perihelion is shown in the following
image which was generated from a FreeBasic compiled Qbasic program. The advance is 180 degrees after 228 orbit cycles. **THIS WILL ALWAYS
BE THE CASE REGARDLESS OF WHICH PROGRAMMING LANGUAGE ONE CHOOSES TO USE.**

Setting the moon average orbit radius at 4e8 meters, with an orbit
speed of 900 m/sec at aphelion, gives an orbit eccentricity of .12
and an advance rate of .