What is the best moon phase for stargazing?
New moon, and the 4–5 nights around it when illumination stays under 20%. That is when the Milky Way turns naked-eye bright over San Pedro — every such night is marked "Prime" in the calendar above.
Free tool · Synodic algorithm
Moon & stargazing calendar
The Atacama has 300+ clear nights a year — the Moon decides how good yours will be. Pick a month and find the dark nights: anything under 20% illumination is prime Milky Way time.
Choose month and year
June 2026: 9 prime nights (under 20% illumination) — Milky Way core season.
Night-by-night moon phases
Su
Mo
Tu
We
Th
Fr
Sa
199%Full
296%Full
390%
483%
574%
664%
754%
843%
933%
1024%
1115%Prime
128%Prime
133%Prime
141%Prime
150%Prime
162%Prime
176%Prime
1811%Prime
1919%Prime
2028%
2138%
2248%
2359%
2469%
2579%
2687%
2793%Full
2897%Full
29100%Full
30100%Full
Prime stargazing (<20% illuminated)Full-moon nights Phases computed from the 2000-01-06 new-moon epoch
Milky Way core season
Right now it is core season (April–October). The galactic center in Sagittarius rides high over the desert on moonless nights — 2 a.m. in April, straight overhead by 9–10 p.m. in July, early evening by September. Pair a prime night with the stargazing tour and you will see why astronomers rent this sky.
Moonrise, simplified
Moonrise shifts about 50 minutes later each night, so a full moon is up all night while a crescent leaves within two hours of sunset. Practical rule for planning: the first quarter (50%) sets around midnight, meaning evenings are dark enough for the core and late nights are for the Moon — a fair compromise if your dates fall near a full moon.
Straight answers
Stargazing & the Moon, FAQ
The four questions every stargazing booking hinges on.
When is the Milky Way visible?
The bright galactic core is properly visible April–October: arcing over the desert from ~2 a.m. in April to early evening by September. On moonless nights it is visible to the naked eye even from town; 15 minutes away it is overwhelming.
Is stargazing good during a full moon?
For planets, craters and lunar detail — yes, telescopes love it. For the Milky Way — no: moonlight washes out every faint structure. If the galaxy is the goal, rebook to a prime night; tour operators swap dates for free more often than you think.
What is the best month for stargazing in Atacama?
June–September is the sweet spot: core season, crisp air and late sunsets. But with 300+ clear nights, any month delivers — pick by moon phase first, weather second.
Found your dark nights?
Lock the stargazing tour for one of the prime dates above — telescope nights sell out first around new moon — then let the trip planner slot the rest of your days around it. The full method, sites and gear tips live in our Atacama stargazing guide.