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Old December 20th 18, 12:36 AM posted to sci.astro.amateur
Gerald Kelleher
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Default earth tilt to 45 deg?

On Wednesday, December 19, 2018 at 9:34:50 PM UTC, StarDust wrote:
What would happen if the Earth's tilt would shift to 45 deg suddenly or in a short period of time?
Would we survive?


How sweet but then again you have to discover a planetary climate spectrum between a Polar climate (0 degree inclination to the orbital plane) and an Equatorial climate (90 degree inclination to the orbital plane much like Jupiter -

http://calgary.rasc.ca/images/planet_inclinations.gif

It means the Arctic circle would extend down to roughly the latitude of Portland Maine whereas presently it is way North -

https://jsis.washington.edu/archive/...datreeline.jpg

All the traits that belong within the Arctic circle would extend downwards to lower latitudes with increasing asymmetries of daylight/darkness and temperature fluctuations as greater surface areas defined by latitudes experience great swings between warm and cold across half an orbit. A polar climate doesn't necessarily means a colder climate as opposed to an equatorial climate, it represents the rate of change in surface conditions across half or a full orbit of any planet.

Of course the orbital proposal which predates De Revolutionibus allows for this climate spectrum for what is called axial precession is really the normal annual increase and decrease in surface areas, expressed as a circumference, where the Sun is in view or out of sight as a function of an orbital surface rotation -

https://en.wikipedia.org/wiki/Axial_...recession..svg

The arrow is facing the wrong direction and the entire surface turns parallel to the orbital plane as a function of the forward motion of the Earth through space but unfortunately the system Copernicus used when correctly identifying this motion was based on Ptolemy's framework where the Sun moves through the constellations and not on the older but more accurate perspective where the background stars come in season.

Axial precession is really a distinct surface rotation so that happens across an orbit hence the easy means to explain the Polar day/night cycle with Polar noon at the South Pole in a few days -

https://epic.gsfc.nasa.gov/