For those not prone to astronomy, this is the beginning of the synodic cycle of the planet Mercury. This doesn’t refer to its orbit around the Sun, but to its apparent path through the sky as seen from Earth and back again. As with any cycle, the starting point is arbitrary. However, using the theme of the abyss, darkness, unseen, unknowable, etc. inferior conjunction seemed the most appropriate. The planet cannot be seen, as with the moon at the new moon. This cycle for our friend Mercury will take about 120 days.
Year 2 Mercury 7