Rebirth Commemoration is the name of the Spring Equinox, it has exactly 12 hours in its day and 12 hours in its night. It is sometimes called a holy day for Mapneas, the Matron of Nature when it actually isn't, it's just the day when she has the most power over Consarcio. Because of this boost in her power, her followers also get an enhancement to their powers.
Rebirth Commemoration
Equinox
3-13-0