The Solar Return is the return of the Sun to it's natal position. The Return Chart is a summary of the year ahead. A striking year will be one where a planet is partile or within a degree to one of the angles like Ascendant or Midheaven.
Here is an old blog where I questioned the rulership of Libra and Virgo, looking at Ceres and Eris. Sitting side by side it seems apt that the two possible candidates are also closely connected in the Persephone Myth. Namely Ceres and Eris.