The sun is not a local point light source, otherwise its angular size would change as it moves. There is no large scale
atmospheric magnification going on which would somehow perfectly match the local sun as it moves away. That's a baseless claim, a strawman to try and get around this problem with FE. It is a ridiculous argument, usually "demonstrated" by setting up a
magnifying glass and a mockup sun on a table
Left is what sunsets look like, right is what they should look like with a small, local sun:
And no, this is not cherry picked evidence of one sunset. The Sun is always huge when it sets, except for extremely foggy or cloudy conditions, but we're talking about clear days here.
That's a huge problem for FE with once again no reasonable explanation to account for these observations.