They can greatly empower magick by themselves, but they alone don’t make or break a ritual, as I explain more here:
I have found that every ritual I have looked at that appeared to fail was done at particularly astrologically unfavorable times, and others find the same to be true (Keep in mind, I had done these rituals without the necessary knowledge of astrology). Similarly, you will find that nearly every action, every endeavor you started that failed was done at an astrologically unfavorable time, and nearly every endeavor that succeeded was done at an astrologically fortunate time. Magick is part of all actions that can be taken.
As Hermes Trismegistus says, “As Above, So Below”. This material world is a mirror of the spiritual world above.
However, it takes great labour, knowledge, and perserverence to learn these things, so following the planetary hours, the phase of the moon, and sign she is in (which the Lamegeton gives electional rules for) will have to suffice.