What's actually happening
A Last Quarter Moon occurs when the Moon is ninety degrees behind the Sun in the zodiac — a waning square. The Moon is half-lit, now diminishing rather than growing. Astronomically it is a point of tension; symbolically it is the moment of release and return.
For a Last Quarter in Aries, the Moon is in Aries while the Sun is in Cancer. The tension is between the forward-moving, assertive quality of the Moon and the protective, inward quality of the Sun.
What the tradition makes of it
The tradition calls the Last Quarter a "crisis of consciousness" — not the crisis of action that the First Quarter names, but the crisis of understanding: the recognition of what was learned in the cycle and what must be relinquished before the next one begins.
Aries brings directness to that release. The thing that needs to go does not need a long process — it needs a decision. The forward momentum that has been building through the cycle finds its final expression not in building but in clearing.
How to actually use it
Identify what from the current cycle has served its purpose and can be released. Make the decision that completes a phase rather than allowing what is finished to continue to occupy space. A Last Quarter in Aries rewards the clean ending.
When in doubt
Ask what is over — and whether you are holding onto it out of genuine need or out of reluctance to begin what comes next.