September Equinox

[kellehe...@gmail.com]

https://www.youtube.com/watch?v=okw6Mu3mxdM

The circumference where the Sun remains constantly out of view at the South Pole presently has now diminished to a small area surrounding the polar latitude, before the one and only unique sunrise on the September Equinox as that latitude turns into the light hemisphere of the Earth while its Northern counterpart turns into the dark hemisphere.

Both polar latitudes turn parallel to the orbital plane as a reflection of the entire surface of the Earth, but this observation is swamped by the dynamic of daily rotation as that orientation shows a Southwest to Northeast motion to the orbital plane. On the March Equinox, that daily rotational orientation is from Northwest to Southeast so the Equinoxes are not 'equal' in this respect.

It is not possible to consider the Earth science of climate without first appreciating the daily and hemispherical fluctuation in temperatures in response to the dual surface rotations of the planet. It means that when daily rotation and all its effects are subtracted, the entire surface of the planet or each location on the surface still turns once to the Sun each orbit as a function of the orbital motion of our home planet.

Feel slightly uneasy that what looks like grandstanding is just the lack of contributors who can add to this more productive approach to the Equinox and Solstice milestones.

[kellehe...@gmail.com]

That should be Northwest to Southeast referenced to the orbital plane presently for the September Equinox and Southwest to Northeast on the March Equinox-

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

[kellehe...@gmail.com]

For as long as it lasts, the one and only sunrise at the South Pole as it turns parallel to the orbital plane and into the light hemisphere of the Earth is captivating-

https://www.usap.gov/videoclipsandmaps/spwebcam.cfm

https://www.youtube.com/watch?v=okw6Mu3mxdM