On the night before the full moon, look up. The disk is nearly full, a bright oval missing only a sliver of shadow. Wait one week. The same size, the same fat oval, but the shadow now sits on the opposite side. That is the difference between waxing gibbous and waning gibbous — and in occult practice, it is the difference between pulling something toward you and pushing it away.
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Learn the difference between waxing gibbous and waning gibbous moons: how to identify them, their history in magic, symbolic meanings, and practical uses in spellwork.
Definition
The waxing gibbous moon is the phase between first quarter and full moon, when the illuminated area grows from half to fully lit. The waning gibbous moon is the phase between full moon and last quarter, when the illuminated area shrinks from full to half. Both look like nearly complete circles, but the waxing gibbous shows its shadow on the left (in the Northern Hemisphere) and the waning gibbous on the right. The one that grows belongs to works of increase; the one that fades belongs to works of decrease.
History and Origins
Ancient observers noted the gibbous moon as a threshold. In Hesiod’s Works and Days (circa 700 BCE), he instructs farmers to sow crops when the moon is waxing — but the gibbous phase specifically is mentioned for tasks that require momentum nearly achieved, like finishing a woven basket or driving a flock to market. Hesiod does not name the gibbous phase as such, but his timing aligns with it: the fourteenth day of the lunar month, one day before the full moon, when the light is almost total.
Roman agricultural writers like Columella (first century CE) refined the rule. In De Re Rustica, he notes that grain harvested under a waning gibbous moon stores longer, because the moisture in the stalk recedes with the light. Households that followed this practice reported fewer spoiled harvests. The rule was not superstition; it was empirical trial observed over generations. The consequence was practical: a family that harvested on the wrong date risked a winter of moldy bread.
The gibbous phase also appears in medieval grimoires. The Picatrix (11th century, translated into Latin in 1256) prescribes the waxing gibbous for talismans meant to attract wealth or love. The waning gibbous, by contrast, is used for talismans that bind or banish. The reasoning is geometric: the moon is shaped like a pregnant belly when waxing, and like a half-eaten fruit when waning. The image itself becomes the spell.
Symbolism and Meaning
The waxing gibbous moon symbolizes near-fulfillment. It is the breath before the final push, the last effort in a long campaign. In many folk traditions, it is called the “growing woman” or “the swelling mother.” The light is almost complete, so the magic is one of refinement: you have done the groundwork, and now you sharpen it.
The waning gibbous moon symbolizes release and distribution. The light is diminishing, but slowly, so the letting-go is gradual. It is not the sudden cut of the dark moon; it is a careful unwinding. Folk names for this phase in rural Ireland included “the emptying cup” or “the loosening moon.” Farmers weaned calves under its light, believing the calf would lose its suckling habit without stress, the same way the moon loses its light without violence.
Together, the two gibbous phases frame the full moon. They carry the charge of the full moon but in opposite directions. A waxing gibbous is a container filling; a waning gibbous is a container draining. The symbolism is not decorative. It dictates the timing of every operation that relies on lunar current.
Practices and Traditions
In modern witchcraft, the waxing gibbous moon is the window for spells that need a final boost. A protective charm sewn during this phase is sealed on the full moon. A money jar that was started under the new moon receives its last ingredient — often a silver coin rubbed with cinnamon oil, when the moon is gibbous. The operation assumes that energy, like the moon, accumulates toward a peak.
We use the waning gibbous for spells that require gradual reduction. Breaking a bad habit, cutting ties with a person, or drying up a source of conflict. The spell is reversed: instead of adding, we subtract. A common method is to write the target on a bay leaf and place it in a glass of water at dusk, adding a pinch of salt each night until the moon reaches the last quarter. The leaf softens, the salt accumulates, and the connection decays.
One concrete detail: practitioners who work with candle magic often dress a gibbous-phase candle by smoothing the oil from the base to the tip for waxing spells, and from tip to base for waning spells. The direction of the hand mirrors the direction of the light. If you have been using the same stroke for both phases, you have been working against the lunar current.
Comparisons: How the Gibbous Phases Differ From Other Lunar Phases
The waxing gibbous is often confused with the first quarter. Both are growing, but the first quarter is half-lit and split, while the gibbous is three-quarters and rounding. The energy of the first quarter is about decision; the gibbous is about momentum. Think of the first quarter as a fork in the road, and the gibbous as the full sprint just before the finish.
The waning gibbous is similarly distinct from the last quarter. The last quarter is a half-lit gate, a point of choice again, but this time to release or persist. The waning gibbous is the gradual unraveling that leads to that gate. In astrological terms, the gibbous moon is associated with the sun signs of Virgo and Sagittarius (depending on the zodiacal system), linking it to analysis and expansion, but this should not be overstated; the phase itself carries more weight than the sign it transits.
Common Misconceptions
“Waxing gibbous and waning gibbous are equally powerful.” They are not. Their power is directional, not symmetrical. A spell aimed at growth done under a waning gibbous will struggle against the current, as will a banishing done under a waxing one. The moon will not cancel the spell, but the energy budget gets smaller.
“You need the exact moment of the phase change.” No. The gibbous phase lasts roughly six days, three before full and three after. Precision helps but is not required. A candle lit on the same calendar date every year for a specific phase will align itself over time.
“The gibbous moon is too bright for shadow work.” Some traditions reserve deep introspective work for the dark moon. But the waning gibbous offers a gentle descent, better suited to those who want to examine heavy themes without plunging into complete darkness. It is the moon for saying goodbye slowly.
“The Southern Hemisphere flips everything.” Yes. In the Southern Hemisphere, the waxing gibbous shadow is on the right, the waning on the left. Our descriptions here assume the northern view. If you work below the equator, invert left and right. The directional symbolism, growth vs. decline, remains unchanged.
FAQ
How can I tell if a gibbous moon is waxing or waning in one glance? In the Northern Hemisphere, look at the side with the shadow. If the shadow is on the left side (the light is on the right), it is waxing gibbous. If the shadow is on the right side (light on the left), it is waning gibbous. An easy mnemonic: “Right light, getting brighter” for waxing; “Left light, leaving night” for waning.
Can I perform a ritual for love under a waning gibbous moon? You can, but it will tend to release love rather than attract it. For attracting, wait for the waxing gibbous. For strengthening an existing bond, the full moon itself is more direct.
What does a gibbous moon mean in astrology? In a horoscope, a person born under a gibbous moon (i.e., the moon was in that phase at birth) is said to be “on the verge,” someone who needs to push for completion, or who has mastered the art of letting go gradually. The astrologer Dane Rudhyar (1967) described the gibbous phase as “the phase of dissemination of knowledge,” a time to teach or share what has been learned before the full moon’s climax.
Which phase is better for divination: waxing or waning gibbous? Both work, but the intent differs. Waxing gibbous divination asks “what is growing in my life that I need to see?” Waning asks “what is ready to be released that I have not acknowledged?” Tarot readers often use a different spread for each.
The gibbous moon is not a minor phase. It is the hinge that the full moon swings on. Knowing which side of the hinge you are standing under changes which door you push.
For more on the full cycle, see our guide to lunar phases in practice. If you want to explore the symbolism of the moon’s shape across traditions, the glossary entry on gibbous traces the word from its Latin root gibbus (hump or swelling) through medieval alchemy. And for a deeper examination of timing your work by the moon, the guide Moon Phases in Spellwork breaks down each day from new to dark.