there is a specific pattern of moon phases and the act of waning means decreasing so when the illuminated side of the moon is shown on earth and is decreasing to lead up to the new moon phase (where you cant see any thing in the sky)that is a waning moon.
The moon is in its waning (shrinking) gibbous phase for roughly the week after the Full Moon.
Waning Waning means decreasing in size, as the Moon moves from the Full Moon toward a New Moon. Waning Gibbous - moving from Full Moon to Last Quarter Waning Crescent - moving from Last Quarter to New Moon
A moon that is reducing in the size, of the illuminated surface visible to earth, day by day.
its called a waning
The moon is waning when it is getting smaller
Waxing
Waning.
Waning gibbous, Third Quarter and Waning Crescent are the 'waning' moon phases.
Crescent.
On Thursday the 3rd Feb 2011 it was a full Moon. On Friday the 11th Feb 2011 it will be a half Moon. Therefore on Saturday 5th Feb 2011 it was a waning Moon between full and half.
Waning.
The correct term is a 'WANING Moon. From Full Moon to the next New Moon, the moon is said to be WANING. From Full Moon to Last Quarter is it a WANING GIBBOUS Moon. From Last Quarter to the next New Moon it is a WANING CRESCENT Moon. In very clear weather you will see the waning crescent Moon, with the 'ghost' of the Moon's full circle. In old lore it is said to be 'The old moon, with the new moon in her arms'.