The balsamic moon is the final sliver before the dark, and practice is unusually unanimous about it: do not start anything, and do not schedule anything you care about.

It is the one point in the cycle where modern astrology, Vedic muhurta and European folk practice all give the same advice, which is to stop. Whether that reflects something real or simply that every tradition needs a fallow period is unanswerable — but a system that never told anybody to rest would be a worse system.