The Waning Crescent is the final phase of the lunar cycle, when only a thin sliver of the lit face remains, shrinking night by night toward the new moon. It appears low in the eastern sky before dawn, rising shortly before the Sun. After it the Moon passes again between Earth and Sun and the cycle begins anew at the new moon. Traditionally the waning crescent is read as a time of rest, surrender, and quiet before renewal, the closing of the round. These are the astronomical facts of the phase together with the meanings traditions attach to it; the thinning crescent is simply the last visible edge of the sunlit hemisphere of the Moon as it approaches the line between Earth and Sun, where its lit face will once more be turned away from us.
The waning crescent is sometimes called the balsamic Moon in modern astrological usage, a term borrowed from the Latin balsamum for a healing resin, framing the phase as a period of distillation and release rather than of decay. In Wiccan and related modern pagan schemes the waning crescent is commonly mapped onto the Crone aspect of a threefold goddess figure, standing opposite the Maiden of the waxing crescent, a symbolic pairing popularised in the twentieth century rather than inherited from older lunar religion. Because the crescent at this stage rises only shortly before the Sun and is quickly lost in its glare, it is also the hardest of all eight phases to observe directly, visible for at most a few minutes low on the eastern horizon before dawn overtakes it.
Sources AstronomyAndrew Fraknoi, David Morrison, and Sidney C. Wolff (OpenStax) with Wicca: A Guide for the Solitary PractitionerScott Cunningham