Waning Crescent Moon
49.9% to 0.1% Illuminated
Waning means that it is getting smaller while crescent refers to the curved shape similar to a banana or a boat.
With some variations, the Waning Crescent Moon rises after midnight and is still up and visible in the morning and day sky before it sets in the afternoon.
Sun Lights Up the Moon
The Moon does not radiate its own light, but the Moon's surface reflects the Sun’s rays. Half of the Moon’s surface is always illuminated by sunlight. Just how much of that light we can see from Earth varies every day, and we refer to this as a Moon phase.
In Western culture, we divide the lunar month into 4 primary and 4 intermediate Moon phases.
The Moon phases start with the invisible New Moon, while the first visible phase is the thin sliver of a Waxing Crescent Moon. Around a week later, half of the Moon’s visible surface is illuminated while the other half is in darkness at First Quarter Moon.
The illuminated part then gradually shrinks into a Waning Gibbous Moon, and when it reaches Third Quarter, the opposite half from the First Quarter is illuminated. From there, it fades into the Waning Crescent Moon before it finally disappears from view again, only to reemerge and repeat this cycle over and over.
Although only a small part of the Moon is directly illuminated by the Sun at the end of the Waning Crescent Moon phase, the rest of the Moon is sometimes also faintly visible. This is because Earth also reflects sunlight as a dull glow onto the Moon. This phenomenon is called earthshine or Da Vinci glow, and it is most noticeable in April and May.
Same Phase Looks Different
The Moon phases are the same all over the world, both in the Northern and Southern Hemispheres. The same percentage of the Moon will be illuminated no matter where on Earth you are.
However, whether the Waning Crescent Moon looks like a banana, a boat, or even an umbrella, depends on the time, the date, your location and the Moon's position in the sky. Exactly which part of the Moon is lit up–the top, bottom, or the side–also depends on how high the Moon is in the sky.
The line–or curve–dividing the illuminated and dark parts of the Moon is called the terminator. The terminator of a Waning Crescent Moon can appear on the right side, the left, the top or the bottom.
No Crescent Moon in Calendars
There is no common symbol for a Waning Crescent Moon in calendars as it is an intermediate Moon phase. Only the 4 primary phases are shown in calendars with the following symbols:
= New Moon = First Quarter = Full Moon = Third Quarter
These symbols reflect the Moon's appearance in the Northern Hemisphere, which can be confusing for people in the Southern Hemisphere, where the opposite side may be illuminated.
The Moon illustration on our Moon phase pages changes as time passes, and indicates more accurately, although not perfectly, which part of the Moon is illuminated in more than 5000 locations worldwide.