[Nateman]

As an airplane moves out of your field of vision it shrinks to a point. Why doesn't the Sun do the same? It keeps that same disc size all day long before it tucks itself under the horizon.

You confuse Crepuscular rays from a nearby source with one from a very distant source. Seeing them does not necessarily imply they are from a nearby source.

[philman_36]

Why doesn't the Sun do the same?
The sun does shrink. You need an arid environment for it to be noticeable. As you know water acts as a magnifier. You know, like how a pencil in a glass of water makes the pencil look bigger. Same principal. Dry air, shrinking sun. Moisture in the air means no noticeable difference.

You confuse Crepuscular rays from a nearby source with one from a very distant source.
No, I don't. A distant source would have rays that come out in apparenly straight lines.
You know, like rays from a light source 93 million miles away. There wouldn't BE crepuscular rays if that were the case.

Seeing them does not necessarily imply they are from a nearby source.
It most certainly DOES mean there is a nearby source.