Here’s a simple way to tell if the moon is growing toward full or waning toward new.
Just remember that “C” is the 3rd letter of the alphabet which is lower (smaller) than “D,” the 4th letter of the alphabet, which is higher (bigger). So when the curve of the moon makes a “C,” it’s waning. And when the curve makes a “D,” it’s waxing.
C = #3 (less than #4)- Waning – loosing light toward New Moon
D = #4 (greater than #3)- Waxing – growing in light toward Full Moon
Because you should know.