Full Moon
Everything is visible, including whatever was being avoided. The full moon is traditionally associated with culmination and with emotions running closer to the surface.
What This Phase Suits
Completion, honest conversation, noticing what is really going on
Fully Lit
A full moon occurs when the Earth sits between the Sun and the Moon, so the entire lit half faces us. It is the opposite configuration to a new moon and, like it, an exact moment rather than a night.
It rises around sunset and sets around sunrise, which is why a full moon is the one phase visible all night. That timing is a direct consequence of the geometry.
The Moon looks flat and detailless at full because the light is coming straight at it and nothing casts a shadow. Craters show best along the terminator at quarter phases.
Culmination And Release
The tradition reads full moons as peaks: things reaching visibility, situations coming to a head, and what has been building becoming apparent.
The corresponding practice is release rather than initiation. Where new moons are for starting, full moons are read as the point to finish, let go, or acknowledge what has already arrived.
It is also the phase associated with clarity in the plain sense of being able to see. Whether that is symbolism or simply an observation about light is a question the tradition does not settle.
Always Opposite The Sun
Because the Earth is between them, a full moon always falls in the sign opposite the Sun. A full moon in April is in Libra or Scorpio while the Sun sits in Aries or Taurus.
That opposition is the structural reason the phase gets read as a tension coming to a head. The two luminaries are as far apart as the wheel allows.
Practitioners read the axis rather than either sign alone — a Leo-Aquarius full moon for the pull between individual expression and collective belonging.
Eclipses And Supermoons
A lunar eclipse is a full moon that falls close enough to a node for the Earth's shadow to cover it. The Moon turns coppery rather than dark, because sunlight bends through the Earth's atmosphere.
A supermoon is a full moon near perigee, the closest point of an elliptical orbit. It is about seven per cent wider than average, which is real and effectively invisible without a side-by-side comparison.
The moon illusion — the apparent enormity of a full moon near the horizon — is not an astronomical effect at all. It is a perceptual one, and photographs consistently fail to reproduce it.
The Behaviour Question
The full moon is the single most studied claim in this entire area. Hospital admissions, crime rates, psychiatric presentations, births — all have been examined repeatedly, and the correlations do not hold up.
The persistence of the belief is well explained without any lunar effect. A memorable night gets attributed to a visible cause, and the quiet full moons are never counted.
The word lunatic preserves the older assumption in the language itself. It is a historical artefact rather than evidence.
Common Questions
Why does the full moon look bigger near the horizon? It does not measure bigger — it is a perceptual illusion. Photograph it at both heights and the disc is the same size.
What is a blue moon? Commonly, a second full moon in a calendar month. The older definition is the third full moon in a season containing four, which is the original and less-used sense.
Does a full moon affect sleep? A few small studies have suggested a slight effect and larger ones have not replicated it. The evidence does not currently support the claim.