The keywords and the weekly elements are from the Spirit de la Lune deck which divides the moonth into 4 weeks of 7 days. Each week beginning with a major moon phase. If you have this deck, draw the appropriate moon card and a tarot card from the weekly element. A synodic moonth - the time between new moon to new moon - is 29.5 days. So, sometimes you will not have a keyword for 1 or 2 days but you will still draw a tarot card.
Week 1 - Air
Week 2 - Fire
Week 3 - Water
Week 4 - Earth
You can switch the elements around and / or choose your own keywords if you don't have this deck. Again, the point is to follow the lunar cycle. I'm interested if anyone else has done or will do this. Tag with #LunarMoonthTarot or #LunarMoonthOracle. Which tarot and / or oracle decks would you use?