The heliocentric model is quite specific in it's prediction of when equinox occurs , the two instances when the sun crosses the celestial equator on the ecliptic plane
Quite correct
- resulting in equal day/night lengths
No - incorrect. This is the part you make up and keep tacking on to everything you say. The minute you start talking about equal lengths of day and night you are no longer talking about equinox, this is equilux.
Here's a concise definition of equilux
https://dictionary.cambridge.org/dictionary/english/equiluxequilux: a date when day and night are of exactly equal length
Please point out where this definition of equilux differs in any way from your personal definition of equinox. If the two are identical, then please say so and maybe reflect on why we need two separate words at all.
( allowance is made for assumed refraction )
Even if there were no atmosphere and no refraction, equinox and equilux would still be different simply because one measures from the two occasions where a single point on the sun (it's centre) crosses the horizon and the other doesn't (it uses two different points).
Observation of these phenomena do not agree with prediction of the heliocentric model (see timeanddate ).
I agree completely with timeanddate's prediction of when the equinox happens (and according to them it's the same time everywhere). Problem is you are not using their predictions, you are making your own equinox predictions, inappropriately using sunrise and sunset times, which without any corrections are completely useless for equinox predictions.