The Best Moon Phase for Stargazing
The single biggest factor you control for a good stargazing night — short of driving somewhere darker — is the moon. Here is how to time it.
Why the moon matters
A bright moon floods the sky with scattered light and washes out faint stars, the Milky Way and most deep-sky objects. Around full moon the sky is so bright that only the moon, planets and brightest stars stand out. As the moon wanes toward new, the sky darkens dramatically.
Pick your window
- New moon (and a few days either side) — the darkest skies and the best time for faint objects.
- Crescent phases — still good once the moon has set; check moonset in the tool.
- Around full moon — best for the moon itself and planets, poor for faint stars.
Use the 30-day calendar to find the next new moon, and the moonset time for your location to plan a window after the moon drops below the horizon.
Work out your dark window
The phase alone does not decide the night — what matters is whether the moon is above the horizon while you are actually observing. A waning crescent rises in the small hours, so the evening stays dark; a waxing crescent sets soon after sunset, so the rest of the night is yours. Take the moonrise and moonset times from the tool, lay them over your observing hours, and what is left is genuinely dark sky.
What else limits the view
Even at new moon, twilight, cloud and light pollution still apply. Full astronomical darkness only arrives once the sun is more than 18 degrees below the horizon, which at high latitudes never happens at all for weeks around the June solstice. Check Sun Times for last light at your location, then use the moon calendar to pick the night.
Find the next new moon and tonight's moonset for your location.
Open the Moon Phase tool