All arch astro data can be shown to be right or wrong .How the data is arrived at is immaterial .It's whether it's right or wrong .
If you can't see why the Michell data is wrong then you don't know "how to do this " Otherwise you would have provided data to show where I or Michell was wrong .
You have provided nothing .

For the umpteenth lets see your data showing where I am wrong .
You can't even imagine how to work out the alt at Men an Tol .

Put your money where your mouth is .