Today is the day that would have been New Year's Day in the 2nd and 3rd millennium in Western Europe and probably the holiest day in Beaker religion.
Today is the vernal or spring equinox in which the dawn goddess brings her brother (the sun) and sister (the moon) in equal phase*. The vernal equinox would not have not been missed by those who buried their dead facing the rising sun and who adorned all of their personal gear with solar and lunar motifs.
|Aphrodite (or Venus) from Pompeii|
In fact, the linguistic variation of "April" or "Avril" suggests 'to open', as in a new year, and a more linguistic and mythological constructions point to a dawn goddess/morning star who rises from the sea foam of Oceanus. (This etymology is contested. A more likely source is from Etruscan from "Apru", aka Venus. On the other hand, it's Etruscan which is another rabbit hole)
Originally, the Roman calendar started with the vernal equinox (today), but the Romans decided early to migrate from the ten month calendar (December, 'deci' being the tenth month) to a more rational twelve month calendar) and later on moving New Year's from Mars (corrected) to Janus's month, January (he being one who looks back and forward) Before the fist of Rome, most European calendars were on the old school system and many of those lasted to early medieval times. I won't dive into the fifty thousand subjects that brings up and will instead say, "Happy Beaker New Year!" and also, "Happy Birthday Beaker Blog"/
*Update* Just a correction. As Maju points out, the first month is Mars in the Roman calendar, followed by April. Assuming they and other Europeans followed a strictly solar calendar, the first month would always be Mars or equivalents, whereas in modern times falls about half and half. In Germanic mythology, the first month before Easter was Hretha or Rheda, who like Venus had twins with the primary war god. Peeling away the layers of divergence and syncretism makes an interesting study.