But, the size of the sun does change over the day. I am confused as to whether you actually researched this or you are just repeating something that you may have heard in grade school or you are just making things up and trying to pass it off as a truth. Could you please enlighten us?
This is the total epitome of flat Earth dishonesty. There are three main tactics as far as I can tell: invent un-specifiable processes that make the world seem like it's round, make meaningless comments, deny simple and well established facts about the world.
It is an uncontroversial and uncontentious fact that the angular size of the sun does not change significantly over the course of the day. If you happened to be at a place on the Earth were the sun was directly overhead at midday, it would be the exact same size in sky at sunset.
If you are going to debate, there has to be a backdrop of facts that we assume are true since we have no good reason for supposing otherwise. The near constant angular size of the sun is one of those facts. If you want to deny it then the burden of proof is on you. It's a fact widely accepted by pretty much the whole of the human race.
Do you see the sun change size in these videos?
Every single source online simply lists the sun as having an angular diameter of about 0.5°. Nowhere does it say anything about this being dependent on the time of day or the location on Earth.
http://astronomy.swin.edu.au/cosmos/A/Angular+DiameterThat's one example, there are plenty others.