p 214. You even quoted it. I cannot tamper with your posts. The link is for p 214. Please read. It will answer your query.
Please dont pretend that you dont understand such simple concepts.
If you are viewing soldiers at midday on a parade ground, and you believe with your naked eye that there is distortion at ground level, this would be caused by heat distortion, or by the ground not being flat.
An effective control for these effects is to move the observations to the sea. There will no longer be heat distortion from the dark pathway, and you can be sure the surface is flat.
All observations made at sea are scientifically superior to men walking on a parade square.
Also, the fact that he made false claims on p. 216 supports my statement "Observations in book discredited. Next explanation?"
As the book contains false information on p.216, there is no way you can be sure that the information on p.214 is not also false
So, Observations in book discredited. Next explanation?