'Void of course' is the astrological equivalent of a loading screen, the hours after the Moon's last aspect before it enters the next sign. Tradition says sign nothing.

It's one of the oldest pieces of practical astrology, used in medieval horary work to mean 'nothing will come of the matter'. Modern practitioners treat it as a few hours for admin, naps and not launching anything. It happens every couple of days and lasts anywhere from minutes to a day.