The Kingdom of Loathing has two moons, Ronald and Grimace. Their phases affect various factors of the game. The phases and effects are shown below. Stat Day means that gains for that stat are increased by 15% on that day. The Grue column indicates whether it is dark enough for the Grue familiar on that day. The Wereseal column shows the strength change given by the Blood of the Wereseal on that day. Next, of course, is the next RL occurence of that phase.

Ronald Grimace Stat Day Grue Wereseal Next
Moxie Yes -100% May 21
Yes -75% May 22
Yes -25% May 23
Yes 0% May 24
Mysticality No +50% Today
No +25% May 10
No +25% May 11
Yes 0% May 12
Muscle Yes 0% May 13
Muscle No +25% May 14
No +25% May 15
No +50% May 16
Mysticality No +50% May 17
No +25% May 18
Yes -25% May 19
Moxie Yes -50% May 20