United Kingdom · International Dark Sky Community
Stargazing at North Ronaldsay Dark Sky Island
How dark this certified sky really is, how far it is from the nearest cities, a live seven-night forecast for the site itself, and the moon-free nights worth planning around. Official DarkSky International page ↗
How dark the sky really is at North Ronaldsay Dark Sky Island
Modelled zenith brightness at the site's coordinates is 21.97 mag/arcsec², which maps to roughly Bortle 2 (what each level means). This is an approximation from the 2024 light-pollution atlas, not a field measurement — and it describes the single point DarkSky lists, not the darkest corner of the community.
This is about as dark as the atlas gets: at Bortle 2 the Milky Way casts visible shadows on moonless nights, the zodiacal light is obvious and the faintest deep-sky objects are within reach of modest optics. Your own light — and the Moon — will be the limiting factor, not the site.
Getting to North Ronaldsay Dark Sky Island
The nearest cities we publish guides for, with the direction to head and a rough drive estimate.
- From Edinburgh
head north · 382.6 km straight-line · ≈497.4 km by road · ≈5.7 h · weekend trip
- From Glasgow
head north · 404.7 km straight-line · ≈526.1 km by road · ≈6 h · weekend trip
- From Belfast
head north · 570.7 km straight-line · ≈741.9 km by road · ≈8.3 h · weekend trip
Estimated from straight-line distance x a 1.3 road-detour factor and staged average speeds (40 km/h leaving town, 70 km/h regional, 95 km/h highway). It is a rough guide, not a routed drive time.
The next seven nights at North Ronaldsay Dark Sky Island
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Plan the next 90 days at North Ronaldsay Dark Sky Island
Moon-free dark windows are astronomy — computable years ahead. Cloud is not: beyond the 16-night forecast nobody knows the weather, and we won't pretend to. What five years of reanalysis can say is how often each month's nights actually stayed clear here.
- Nov 3–1614 moon-free nights11% of November nights here stayed clear (2021–2025)
- Dec 2–1514 moon-free nights12% of December nights here stayed clear (2021–2025)
- Dec 31 – Jan 1314 moon-free nights12% of December nights here stayed clear (2021–2025)
Clear nights by month, 2021–2025
- Jan10%
- Feb18%
- Mar21%
- Apr33%
- May28%
- Jun33%
- Jul19%
- Aug25%
- Sep28%
- Oct10%
- Nov11%
- Dec12%
Clearest months historically: April (33%), June (33%), May (28%); across the year 21% of nights with astronomical darkness stayed clear.
"Clear" = weighted cloud cover (low 0.5 / mid 0.3 / high 0.2) ≤ 20% across the night's astronomical darkness. ERA5 reanalysis via Open-Meteo Archive, 2021–2025 (CC BY 4.0) — historical frequency, not a forecast. Once a window comes within 16 nights, the live forecast above takes over.
Put North Ronaldsay Dark Sky Island's dark-sky nights on your calendar
Every month has a stretch of nights when the Moon leaves the dark hours at North Ronaldsay Dark Sky Island essentially moon-free. Subscribe once and each window lands in your own calendar, about a year ahead — no account, no email.
moon & darkness geometry only — cloud can't be known this far out; check the live forecast above when a window gets close
Questions people ask about North Ronaldsay Dark Sky Island
- How dark is the sky at North Ronaldsay Dark Sky Island?
- Modelled zenith brightness from the 2024 World Atlas of Artificial Night Sky Brightness puts North Ronaldsay Dark Sky Island at about 21.97 mag/arcsec², roughly Bortle class 2. That is an approximation derived from satellite data, not a field measurement; it is certified by DarkSky International as an International Dark Sky Community.
- How far is North Ronaldsay Dark Sky Island from Edinburgh?
- About 382.6 km in a straight line, heading north from Edinburgh. Using a 1.3 road-detour factor and staged average speeds that is roughly 497.4 km and 5.7 h of driving — an estimate, not a routed drive time.
- When is the next moon-free dark window at North Ronaldsay Dark Sky Island?
- The next stretch of essentially moon-free dark hours runs Nov 3–16 (14 nights), computed from Moon phase and altitude with Skyfield and JPL DE440s. Cloud cannot be known that far ahead; the live seven-night forecast on this page shows real cloud cover once a window is close.
- What is the clearest month at North Ronaldsay Dark Sky Island?
- Over 2021–2025, April (33%), June (33%), May (28%) had the highest share of nights with astronomical darkness that stayed clear (weighted cloud cover ≤ 20%); across the year it was 21%. ERA5 reanalysis via Open-Meteo — historical frequency, not a forecast.
Place name and coordinates: DarkSky International (reviewed 2026-07-15, data 2026-10-13). Light pollution: David Lorenz, World Atlas 2024 (EOG VIIRS, CC BY 4.0), approximate. Cloud: Open-Meteo.com (CC BY 4.0). Moon and darkness geometry: Skyfield + JPL DE440s, computed locally. Drive times are estimates, not routes.