The Solar Courts refers to the Dawn Court , the Day Court and the Night Court because as opposed to being with a name with a season (Spring , Summer , Autumn , and Winter), it refers to a time of day.
While the seasonal Courts experience only one season the Solar court experience all four seasons. And unlike what most of us expected, the Solar Courts do not alter the Sun's path. Instead, the part of the day upon which the court has been named is said to be the most beautiful. That is, in the Dawn Court , the dawn of the day would be the most beautiful and likewise for the Day Court and the Night Court.