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A close and small object (like sun) at 3000 miles altitude can not explain equinoxes.
Research it!
OK I researched it:
The apparent position of the Sun during the equinoxes (caused by atmospheric lensing combined with the perspective of an observer at sea level) is consistent with an approximate distance of 3,000 miles as measured directly by a sextant.
Proof your sceince and explain more!
On a equinox sun sets due west and rise due east for every observer. it can not happen for a small and close sun at azimuthal map projection even with atmospheric lensing combined with the perspective of an observer at sea level.