Axial Tilt

Axial tilt (Celestial Bodies) or obliquity is recognised as being the inclination of a planet relative to its orientation of rotation around the Sun: the ecliptic plane. The seasons have their origins in this change as any year progresses. The same observed continuously changing elevation of the Sun throughout the year would still happen if the ecliptic plane was not at the accepted average of 23.5 degs.  If this angle were greater, the shortest day would have the Sun closer to the horizon and very high for the longest day. A lesser angle would alter the altitude of the Sun to a lesser extent throughout the year.

It becomes an interesting exercise to speculate about the evidential 'proof' for this acceptance and differentiate between the two perceptions.

Axial Precession
Titius-Bode - caution