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The real inequality on the Equinox

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Subject: The real inequality on the Equinox
From: kelleher...@gmail.com (Gerald Kelleher)
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by: Gerald Kelleher - Sat, 18 Mar 2023 20:49 UTC

https://en.wikipedia.org/wiki/Deep_Space_Climate_Observatory#/media/File:EpicEarth-Globespin-tilt-23.4.gif

Viewed from the orbital plane and from the ecliptic Equator on the surface, the orientation of daily rotation on the September Equinox runs Northwest to Southeast.

On the March Equinox, the orientation runs Southwest to Northeast.

On the other hand, the North and South poles turn parallel to the orbital plane at all times throughout an orbital cycle.

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Subject: Re: The real inequality on the Equinox
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by: Gerald Kelleher - Sun, 19 Mar 2023 10:25 UTC

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.

Subject	Author
The real inequality on the Equinox	Gerald Kelleher
Re: The real inequality on the Equinox	Gerald Kelleher