The Obliquity of the Ecliptic
The 23.4° tilt between the two reference planes, which is the tilt of the Earth's axis, and what follows from it: the Sun's changing declination, the seasons, the tropics and the polar circles.
The 23.4° tilt between the two reference planes, which is the tilt of the Earth's axis, and what follows from it: the Sun's changing declination, the seasons, the tropics and the polar circles.