northern
  hemisphere

The wheel of the year was created in the northern hemisphere, so  each Festival lines up perfectly with a  Zodiac Sign, marking not only celestial events, such as solstice and equinoxes but also seasonal times.

southern
  hemisphere

The wheel of the year for the southern hemisphere, is out of alignment with the north, due to our seasons being 6 months  out – summer in the north, winter in the south. Each Festival no longer lines up with perfectly with its corresponding  Zodiac Sign. Making the southern wheel more about solstice and equinoxes but also seasonal times.