Linked from
The 26 pages that link to Axial tilt, each with the reason it gives.
Earth's orbitRelated: Earth's tilt relative to its orbit produces the seasonal cycle.
Celestial equatorRelated: Earth’s tilt makes the celestial equator inclined to the ecliptic.
SunriseRelated: Earth's tilt drives seasonal shifts in sunrise position and timing.
SunsetRelated: Earth's tilt drives seasonal changes in sunset time and the Sun's path.
Tropic of CancerRelated: Earth’s tilt sets the farthest north the Sun reaches the zenith.
DaytimeRelated: Earth’s tilt makes daylight duration change by season and latitude.
Atmosphere of UranusRelated: Uranus’s extreme tilt creates exceptionally long, uneven seasons.