axial inclination

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ax·i·al in·clin·a·tion

(aksē-ăl inkli-nāshŭn)
Angle formed by long axis of tooth with plane of the bone from which it arises.
References in periodicals archive ?
As a result, by themselves, their spin axes would precess with the same rate as the orbital oscillation, which may cause large variations in their axial tilt. Fortunately, the moon keeps Earth's variations in check.
(ii) Case 1-B represents a pseudo dual-axis tilt (axial tilt) referred to in [33].
However, our Earth has both an eccentric orbit and axial tilt, so our actual analemma is the figure-8 in the illustration.
"Mars is in the habitable zone in our solar system, but its axial tilt has been very unstable - varying from zero to 60 degrees," Gongjie Li, the lead author of the study, said in a (https://www.eurekalert.org/pub_releases/2018-06/giot-mct062818.php) statement .
Earth hosts life with an axial tilt of about 23.5 degrees, which undergoes minor changes over a long period of time.
In addition to causing seasons, this axial tilt (known as obliquity) allows sunlight to fully illuminate the poles--periodically even at midnight--so that over a year, remote-sensing satellites can image the entire surface of our planet.
"It also appears that when atmospheric carbon dioxide concentrations reached 400 parts per million around four million years ago, the associated global warming amplified the effect of the Earth's axial tilt on the stability of the ice sheet," he said.
The solstice happens twice annually due to the Earth's axis of rotation, and known as the summer and winter solstice. The scientific reason behind summer solstice is that it occurs precisely when the Earth's axial tilt is most inclined toward the sun, at the degree of 23AaAaAeAe[degrees] 26 its most extreme. 
This is a figure-8 pattern that depicts the Sun's mean motion in the sky, which changes due to Earth's axial tilt and orbital eccentricity, throughout an entire year.
In this orientation, and because Uranus presents "horizontally" due to its extreme axial tilt, the planet's north pole is on the left of your blank disk (slightly above the 9 o'clock position).
For science aficionados, the summer solstice happens precisely when the Earth's axial tilt is most inclined towards the sun, at the degree of 23A[degrees] 26', at its most extreme.
Just as solargraphy is an excellent project to teach about the axial tilt of Earth, the technique also gives us the opportunity to see what the world would look like if our eye could compress half a year into a single frame--phenomena occurring on astronomical time scales concentrated into a single picture.