A decrease in the visible surface of the moon as the days progress.
NM, WC, FQ, WG, FM, WG, LQ, WC. (not sure why this is important) New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon, Waning Gibbous, Last Quarter, Waning Crescent.
Because the moon goes through its entire repertoire of phases every 29.53 days,
completing the cycle 12 or 13 times in a year, whereas eclipses occur irregularly,
and typically not more than 4 or 5 times in a year.
the same side of the moon we always see, you can never see the other side of the moon