Ok, what about 'perspective' do you think proves the globe? Sorry but no rando personal beliefs will do. If you're going to use science or math, it really has to hold up on its own. Science and math work with the description provided in Scripture and the form of the Earth described isn't a globe. Saints also support the flat earth along with the Fathers of the Church because Scripture is the basis of their teachings.  If you think you're going to fly some theory in contradiction with Scripture, history, the Fathers of the Church, saints, etc. because you favor a modern view of a pagan globe, you have the greater burden of proof. The Pythagorean doctrine and Copernican globe theory were consistently condemned by the Church multiple times. If you don't realize this, or accept the Cecco/Bruno/Galileo condemnations by the authorities of the Catholic church, as well as the definitive statements by the popes condemning heliocentrism/Copernicanism/Pythagorean Doctrine, please provide proof to show that these saints and popes were wrong.

Great response. I don't have a unargumentative answer. But I do have a question I think will addresses the problem. Why does the Church allow the modernist bishops to blather nonsense? My suggestion is that the Church is slow to respond to all the trash flung at Her. I believe the Church and Our Lord expect the faithful to reflect on the situation and make a stand to defend what the Church already declared, especially against pagan or heretical teachings. Some pope or bishop or cardinal will come forward to clarify, but we have the information, and apparently, we have to wait until they do. 

What I don't understand is if all this was condemned by the Catholic Church, then why did they teach a globe earth in their parochial schools? 

Putting math aside, and regardless of the circuмference of the globe in miles, observing the effects of the sun from various locations on earth should be sufficient to demonstrate the shape of the earth.

What value is math unless it is the standard of truth? But I would argue that math is a tool used to represent and further estimate truth that already is. You first find the math that conforms to the part of reality in question, then use it to scale things or simulate reality or to estimate a likely, but unknown part of reality. It is possible to use math to prove "realities" that don't really exist. There was a Greek philosopher who thought nothing really moves because it would, according to math, have to cross an infinite number of fractions of distance. Quite probably in reality there is a limit to how small distances can get, so things don't have to pass infinity to move a finite amount.

Putting math aside, and regardless of the circuмference of the globe in miles, observing the effects of the sun from various locations on earth should be sufficient to demonstrate the shape of the earth. It is a sort of blindness not to understand that. Give it time though, and with humility pray on it, as it can take time for things to click and make sense differently than you used to believe.

Some experiments employ math techniques like scaling for flat earth results. For instance, the Bolivian salt flats help prove the earth is not a globe.  Kansas and the Midwest flat states also work to show that earth is not a globe. Oceans are the biggest tell. Yet people pretend that those aren't enough because they think they see curve outside their airplane window seat or watch ships disappear over the horizon. People also use math to prove realities that do not exist, that is, they use math to tell a lie. Like the pretense that goes into telling people the earth is a globe. After a very long time, I still have not met a single globe believer use math to prove the global curve exists.  They make weird attempts insisting it is proven, they can even fill entire chalkboards with numbers and symbols yet never produce results that are repeatable and verifiable by anyone but themselves. 

I have not done the sun, but personally observed the moon from various positions on the Earth at the same time by simultaneous contact with multiple individuals from various countries online. The moon is identical (full or partial) even on opposite sides of what would be a globe. Africa, Asia, South America, North America, Europe and Australia. We also verified that the moon rolls like a wheel (same face) as the night progresses.  Other experiments are also easily done. However, some experiments need to be done by people with the means and tech to pull them off.  We have those results, too.  What's interesting to me, is that the people who use math, obtain results that coincide with Scripture. The people who claim the earth is a globe rarely do experiments themselves. If they actually do experiments, interestingly, they never support their results with Scripture. That alone is a mathematical constant.

Salar de Uyuni (or "Salar de Tunupa")[1] is the world's largest salt flat, or playa, at 10,582 square kilometres (4,086 sq mi) in area.[2][3] It is in the Daniel Campos Province in Potosí in southwest Bolivia, near the crest of the Andes at an elevation of 3,656 m (11,995 ft) above sea level.[4]

The earth is said to be 25,000 mi in circuмference (NASA)
4 of 25 is 16%.

So according to the Salt Flats in Bolivia just under 1/5 of the globe is measurably and admittedly flat.

The Great Plains is a broad expanse of flatland in North America. The region is located to the east of the Rocky Mountains, much of it covered in prairie, steppe, and grassland. They are the western part of the Interior Plains, which include the mixed grass prairie, the tallgrass prairie between the Great Lakes and Appalachian Plateau, and the Taiga Plains and Boreal Plains ecozones in Northern Canada. "Great Plains", or Western Plains, is also the ecoregion of the Great Plains or the western portion of the Great Plains.
The region is about 500 mi (800 km) east to west and 2,000 mi (3,200 km) north to south. Much of the region was home to American bison herds until they were hunted to near extinction during the mid/late-19th century. It has an area of approximately 500,000 sq mi

This area is far greater in size than the Salt Flats, although a bit irregularly shaped.  Still, it is made up of 500,000 sq miles of virtually flat land.  That much flat area on a globe of 25,000 sq miles would deform the sphere so badly, it could not be properly called a globe.  Add the Salt Flats and other large flat areas (not included here) and you either have a blob, or the earth is flat.