Look up at the sky on any clear night and the Moon may appear as a slender crescent, a bright half-disc, a swollen gibbous, or a blazing full circle. These shapes are not the result of Earth's shadow — that's a common myth. They are the result of geometry: the changing angle between the Sun, Earth, and Moon as the Moon orbits our planet once every 29.5 days.
This guide covers all eight named phases of the lunar cycle in detail, including what causes them, what they look like from Earth, when you can see them during the night, and what they symbolise in the world's astrological traditions.
Key fact: The Moon completes one full cycle of phases — called a synodic month — in exactly 29.530588853 days. This is slightly longer than the 27.3-day sidereal month because as the Moon orbits Earth, Earth is also moving around the Sun, so the Moon needs a little extra time to "catch up" to the same Sun-relative position.
Why Does the Moon Have Phases?
The Moon produces no light of its own. Every bit of moonlight is sunlight reflected off the Moon's grey, rocky surface. At any given moment, exactly half the Moon is lit by the Sun — but from Earth, we see different portions of that lit half depending on where the Moon is in its orbit.
When the Moon is between Earth and the Sun (New Moon), the lit half faces away from us and the Moon is invisible. When Earth is between the Sun and Moon (Full Moon), we see the entire lit hemisphere. Every other phase is a transitional view of the lit portion as the Moon moves through its orbit.
The 8 Phases in Order
🌑 1. New Moon (0% illumination)
The New Moon occurs when the Moon lies between Earth and the Sun, with its illuminated side facing away from us. The Moon is effectively invisible in the night sky — or visible only as a faint dark disc silhouetted against the Sun during a solar eclipse. The New Moon rises and sets with the Sun.
When to see it: Technically invisible. You may spot an extremely thin crescent low on the western horizon in the 1–2 days after New Moon, just after sunset.
Astrological meaning: The New Moon is considered a time of new beginnings, intention setting, and planting seeds — both literally and figuratively. It is the traditional start of the lunar month in many calendar systems.
🌒 2. Waxing Crescent (1–49% illumination)
A waxing crescent appears as a thin sliver of light on the right side of the Moon (in the Northern Hemisphere), growing thicker each night. "Waxing" means increasing in size; "crescent" describes the curved, less-than-half shape.
When to see it: Visible in the western sky after sunset, setting a few hours after the Sun. Best seen at dusk.
Astrological meaning: A time of forward momentum, gathering energy, and taking initial steps toward goals set at the New Moon.
🌓 3. First Quarter Moon (50% illumination)
At First Quarter, exactly half the Moon's face is illuminated — the right half in the Northern Hemisphere. Despite being called a "quarter" moon, it looks like a half-circle. The name refers to the fact that the Moon is one quarter of the way through its full cycle.
When to see it: Rises around noon, high in the southern sky at sunset, sets around midnight.
Astrological meaning: A moment of decision and challenge. The halfway point to the Full Moon brings obstacles that test commitment to intentions set at the New Moon.
🌔 4. Waxing Gibbous (51–99% illumination)
A waxing gibbous moon is more than half illuminated but not yet full. The word "gibbous" comes from the Latin for "hump" — the Moon has a swollen, oval shape during this phase. It continues brightening toward the Full Moon.
When to see it: Rises in the afternoon, visible through much of the night, setting before sunrise.
Astrological meaning: Refinement, adjustment, and building toward completion. A time to review progress and fine-tune efforts.
🌕 5. Full Moon (100% illumination)
The Full Moon is the most dramatic and well-known phase. Earth is positioned between the Sun and the Moon, and we see the entire illuminated face. The Full Moon is bright enough to cast shadows and makes the night sky substantially lighter.
When to see it: Rises at sunset, reaches its peak in the middle of the night, and sets at sunrise — visible all night long.
Astrological meaning: Culmination, illumination, and the completion of a cycle. Full Moons are associated with heightened emotion, clarity, and revelation. Each Full Moon has a traditional name — the Harvest Moon, the Wolf Moon — tied to the season and agricultural calendar.
🌖 6. Waning Gibbous (51–99% illumination, decreasing)
After Full Moon, the illuminated area begins to shrink. The Waning Gibbous Moon is still more than half lit but is losing illumination each night. "Waning" means decreasing.
When to see it: Rises after sunset, peaks late at night or in the early morning hours. Still very bright.
Astrological meaning: A time of gratitude, sharing, and beginning to release what is no longer needed. The energy of the Full Moon dissipates gradually through this phase.
🌗 7. Last Quarter Moon (50% illumination, decreasing)
The Last Quarter mirrors the First Quarter — half the Moon's face is illuminated — but now it is the left half (Northern Hemisphere). The Moon is three quarters of the way through its cycle.
When to see it: Rises around midnight, high in the sky at dawn, sets around noon.
Astrological meaning: Reflection, release, and clearing. A good time to let go of what is not working and prepare space for the next cycle.
🌘 8. Waning Crescent (1–49% illumination, decreasing)
The final phase before New Moon. The illuminated area shrinks to a thin crescent on the left side of the Moon. This is the "dark of the moon" — the quietest, most introspective phase of the cycle.
When to see it: Rises in the pre-dawn hours, visible in the east before sunrise.
Astrological meaning: Rest, surrender, and preparation. The ideal time for reflection, recuperation, and readying yourself for the fresh start of the New Moon.
The Full Lunar Cycle at a Glance
| Phase | Illumination | Moon Age | Best Viewing Time |
|---|---|---|---|
| 🌑 New Moon | 0% | 0 days | Not visible |
| 🌒 Waxing Crescent | 1–49% | 1–7 days | After sunset, west |
| 🌓 First Quarter | 50% | 7–8 days | Midday to midnight |
| 🌔 Waxing Gibbous | 51–99% | 8–15 days | Afternoon to early morning |
| 🌕 Full Moon | 100% | 15 days | All night |
| 🌖 Waning Gibbous | 51–99% | 15–22 days | Evening to late morning |
| 🌗 Last Quarter | 50% | 22–23 days | Midnight to noon |
| 🌘 Waning Crescent | 1–49% | 23–29 days | Before sunrise, east |
Common Misconceptions About Moon Phases
"The shadow on the Moon is Earth's shadow." This is the most widespread moon myth. Earth's shadow only falls on the Moon during a lunar eclipse — a relatively rare event. At all other times, the different appearance of the Moon is simply which portion of its permanently illuminated half we can see from our angle.
"The Moon is much bigger at the horizon." The Moon Illusion is a well-documented perceptual phenomenon. The Moon near the horizon appears larger to the human brain due to comparison with foreground objects, but its actual angular size in the sky is the same whether it's on the horizon or high overhead.
"There is a 'dark side' of the Moon." The Moon is tidally locked, meaning the same face always points toward Earth. But all parts of the Moon receive sunlight at some point during the lunar month. The "far side" is more accurate — and it receives just as much sunlight as the near side.
See Tonight's Moon Phase
Want to know exactly which phase the Moon is in right now? Visit our homepage for live lunar phase data, including the current illumination percentage, moon age, and moon sign.