This is the closest image I could get to what is necessary for explaining the relationship between the rotational axis and the ecliptic or orbital plane, and that image is only valid for the September Equinox but not the March Equinox-
https://eu.usatoday.com/story/graphics/2023/03/18/spring-equinox-visual-guide/11485425002/
I have come to understand that many of the difficulties can be cleared up by focusing on what happens across a circuit by looking at the planet from the fully illuminated side of the Earth and the orbital plane rather than the traditional sideways view
with half light/half dark.
https://www.youtube.com/watch?v=-OgLCH7jYp8
On the June Solstice, the North pole is mid-way to the planet's divisor separating the light and dark hemispheres.
https://en.wikipedia.org/wiki/Deep_Space_Climate_Observatory#/media/File:EpicEarth-Globespin-tilt-23.4.gif
On the September Equinox, the North pole has turned across those three months to sit on the divisor and, passing into the dark hemisphere, experiences the one and only sunset in any given year. The focus is on the change in orientation to the orbital
plane as the North/South poles continue to turn, reflecting an inviolate fact.
If daily rotation is subtracted along with all its effects, the entire surface would still experience a single day/night cycle across an orbital circuit. This rotation, albeit difficult to perceive because daily rotation swamps the orbital-generated
rotation as an observation, is crucial for appreciating not only the true cause of the seasons but also planetary climate.
Of all the technical issues I have dealt with over the years, this was, by many measures, the hardest to get a footing on.
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