When should you look for crescents, quarters and full moons?
Lunar phase is also a clue to viewing time. Distinguish an evening Moon from a morning Moon.
Phases are not Earth’s shadow
Ordinary phases show a changing portion of the sunlit lunar hemisphere. Earth’s shadow produces a lunar eclipse, a different event. Two half-lit moons can have different viewing times depending on whether they are waxing or waning.
A rough planning table
| Phase | Try first |
|---|---|
| Waxing crescent | Low west after sunset |
| First quarter | Evening; generally south in Korea |
| Full | East near sunset; higher later |
| Last quarter | Before dawn |
| Waning crescent | Low east before sunrise |
These are approximate relationships, not exact schedules. Date, season, latitude and hemisphere affect the path and appearance. Avoid searching near the Sun with binoculars or telescopes.
A phase instant is not an entire day
Full moon is a specific astronomical moment. A calendar date labels that moment in a timezone; it does not mean an unchanging phase all night. A representative daily illumination value and an exact phase event answer different questions.
Choose for your goal
For an evening walk, start with waxing phases. For surface relief, examine the terminator near quarter phases with enough altitude. Even a bright Moon can be below the horizon or behind cloud.
Purpose planner · Moon classroom · Observing places
Sources and review
Moon Where operator · Reviewed: 2026-10-07. AI assisted drafting; explanation reviewed against cited sources and application code. Hypothetical examples are identified.