I have a link for everyone, I don't know if everyone has it, but this link shows the phase of the moon as of now and it updates according to your computer clock and the day....
Phase of the MoonThere also seems to be a quick computer download to keep you up to date as well...I don't know if people will like this, but I know most children(under 18 or so) cannot go outside to look at the moon to see if they can preform their ritual/spell. So, maybe this will be easier.