I don't know exactly. I think around 24 as it looked like it was just starting to wane on New Years Eve. Hmm.. Maybe it was waxing. :P

I used to work nights, and I could keep track of this naturally. Now, on my Google homepage I have the moon calendar with a picture of the current moon phase. I see it every day. If I want to estimate, I keep in mind 28 and 14. If there's a new moon, then full is 14 days away. Learning this was a conscious process, an intentional thing, thinking about cycles, degrees, days in the cycle, which side is a wane, which is a wax. Then you cement the knowledge by thinking about it physically as it is happening in the three dimensions in space. (I often think of the calculations in 2 dimensions.)

about 19 days.

Look for the moon. The moon is up at night for the weeks around a full moon and during the day for the new moon. The cycle takes 29 days (four weeks, give a day). It rises in the east and sets in the west, like the sun. If the visible part of the moon is on the right, toward the west, then it is waxing and a full moon will follow within two weeks, depending on how full it is. If the visible part of the moon is on the left, then is is waning and a new moon follows.

With these facts and a regular look at the sky, you should be able to predict when the moon will be full next without on-line widgets or your printed calendar.

It was full yesterday--July 11.

Last night was a full moon so there won't be another for 27 days.

23 days.

I know because my web browser is set to http://www.astroworld.us/

My calendar has the moon's cycles, as does the farmer's almanac.

Yes, there are many widgets these days which will display this. I am using a Mac widget by Grandeas Software. Does anyone have a suggestion for a Windows widget?

24. A quick check of the calendar. If the moon is visible at night, I usually point it out to my kids and encourage them to see it get bigger/smaller the next few days.

Zero: tonight is full moon.

When it gets nice and round and rises right at sunset, it's full.

This also helps with moonrise; a full moon is only up at night (which makes sense when you think about it.)

Any calendar, also weather.com

No idea/

1. LOOK UP
2. Get a shareware moon-cycle proggie
3. Look it up on google or somewheres
4. Get the kids to do a project by counting the days and drawing the moon on each night - keep it on the fridge

HA! Ten! All right, five. Forgot to look at the moon last night. When I do remember to look, I can tell a waning gibbous from a waxing crescent, that's for sure.