"Our bodies are our gardens, to the which our wills are gardeners. So that if we will plant nettles or sow lettuce, set hyssop and weed up thyme, supply it with one gender of herbs or distract it with many—either to have it sterile with idleness, or manured with industry—why, the power and corrigible authority of this lies in our wills." --Shakespeare, Othello.
The astrological signs govern parts of the body (ie Capricorn = skin)
When the moon is in a certain sign (ie: we just had a full moon in Capricorn),
doing something to improve that part of the body will yield greater results (ie: have a facial at the spa when the moon is in capricorn and your skill will improve more dramatically than when having a facial at any other time).
This works the opposite way as well: You might not want to go out drinking when the moon is in Cancer which rules the liver! The alcohol is said to have an even more detrimental effect on the liver at that time. However, if you drink Milk Thistle tea when the moon is in Cancer, it will benefit your liver even more than usual.
Do you try to work with the lunar rhythms? I have my astrology calendar up which has moon phases, signs, aspects and when it' void of course. I do my best to keep an eye out for the most beneficial times to do things, but if something has to happen at a certain time despite lunar position, I'm ok with going for it.