For those who don't know, angular diameter is, the space a celestial object seen from the surface Earth takes up .

http://www.daviddarling.info/images/...r_diameter.jpg


It is observer centric as it takes no account of the relative size of the object compared to Earth and gives no feel for the expanse of the celestial arena and by association the motions of the Earth nor the central Sun. At best angular diameter is a term for a celestial diorama pasted on to a rotating celestial sphere limited to the local horizon.

I came to understand on the topics of the dual twilight events (daily twilight/polar twilight) due t separate rotations and the variations in twilight length daily across latitudes due to diminishing speeds across latitudes that observers here are not only stuck with a flat Earth ideology but their view is bound by a observational diameter of 6 miles,at least at sea level -

https://www.weather.gov/images/fsd/astro/twilight.png

It is not advisable to shame people into looking at what they believe, it is more preferable to discuss the ins and outs of dual twilight and variations in twilight lengths using actual causes but obviously the mind tutored in late 17th century celestial sphere concerns won't allow the new insights in by a refusal to change the pretense upholding their system.

That graphic on twilight says it all, it is the lowest of the low in intellectual,historical and technical terms and people should be ashamed even if the angular diameter types are unable to experience it.