The concept of Axial Tilt [aka Obliquity] is very straightforward.
In astronomy, axial tilt, also known as obliquity, is the angle between an object’s rotational axis and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane.
However, the concept has gone pear-shaped thanks to some Eccentric Astronomers.
British slang for events taking an unexpected turn for the worse.
Firstly, there are two “standard methods” for specifying Axial Tilt.
Secondly, neither of these “standard methods” conform to the definition of Axial Tilt.
This is because the two “standard methods” [for whatever reasons] confuse the simple concept of Axial Tilt by:
a) Introducing conflicting concepts of a North Pole.
b) Conflating the concept of Axial Tilt with Rotation.
c) Applying arbitrary adjustments to the concept.
The IAU looks for inspiration from a wobbly invention called…
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