Moon Phases on Your Garmin — What They Are and Why They Matter
A crescent moon icon on your watchface looks nice. But moon phases are more than decoration — they have real, practical implications for outdoor activities, fishing, and even sleep.
The eight phases
The moon completes a full cycle every 29.5 days, moving through eight distinct phases:
| Phase | What you see | Illumination |
|---|---|---|
| New Moon | Invisible | 0% |
| Waxing Crescent | Thin sliver, right side lit | 1–49% |
| First Quarter | Half moon, right side lit | 50% |
| Waxing Gibbous | More than half lit | 51–99% |
| Full Moon | Complete disc | 100% |
| Waning Gibbous | More than half, left side lit | 99–51% |
| Last Quarter | Half moon, left side lit | 50% |
| Waning Crescent | Thin sliver, left side lit | 49–1% |
In the northern hemisphere: crescent lit on the right = growing (waxing), lit on the left = shrinking (waning).
Why it actually matters
Night hiking and trail running — A full moon provides enough light to navigate open terrain without a headlamp. A new moon means genuine darkness. Plan accordingly.
Fishing — Lunar cycles influence fish feeding behaviour. The days around full or new moons, when tidal forces are strongest, tend to produce more active fish.
Tides — Full and new moons produce spring tides (higher highs, lower lows). Quarter moons produce neap tides. If you're near coastal terrain or tidal zones, the phase tells you about tide amplitude.
Wildlife and photography — Many nocturnal animals are more active during a full moon. A new moon window means darker, quieter conditions.
Sleep — Some research suggests shorter, lighter sleep around the full moon. Knowing the phase gives context to an otherwise puzzling restless night.
On your Garmin with KairosEye
KairosEye displays the current moon phase directly on the watchface. You can see at a glance whether tonight's run will have moonlight, or whether the weekend fishing trip lands on a new or full moon — without unlocking your phone.
The astronomy section also includes sunrise, sunset, and civil twilight times, giving you a complete picture of natural light conditions for the day.