Dark Sky Planner

Find the darkest nights for stargazing, visual astronomy, and astrophotography.

Dark Sky Planner analyzes your location and observing schedule against sunset, twilight boundaries such as astronomical dusk and astronomical dawn, moonrise, moonset, Moon horizon times, and Moon illumination so you can plan around the nights with the least moonlight.

Observing location

Search for a city, ZIP code, open the map for an exact observing spot, or use precise browser location.

Location name

Timezone

Latitude

Longitude

Dates and observing window

Start date

End date

Window start

Window end

Moon rule

Illumination threshold (%)

Used by the selected moon rule. Use 10 for 10%.

Days of week

Select the days you are available to observe, such as Friday and Saturday. Select at least one day.

Show excluded dates on report

Location search uses OpenStreetMap Nominatim data. Map tiles are rendered through Leaflet.