Sure thing, don't believe your own eyes, believe you instead.
Oh but wait, even if we bought into your optical perspective theory, the sun is a giant ball of light and thus would still be visible and lighting up the entire sky at night.
That isn't setting then. So you're saying don't believe your eyes. I see the sun go below the horizon, I don't see an object getting farther and farther away.
Sure thing, don't believe your own eyes, believe you instead.
Oh but wait, even if we bought into your optical perspective theory, the sun is a giant ball of light and thus would still be visible and lighting up the entire sky at night.
Great then the sun sets and goes below the horizon.
When light gets blocked by particles it doesn't look like a sunset.
That isn't setting then. So you're saying don't believe your eyes. I see the sun go below the horizon, I don't see an object getting farther and farther away.