The most important piece of stargazing equipment is not a telescope — it is a dark sky. Under heavy light pollution even a good telescope shows little, while under a truly dark sky the naked eye reveals the Milky Way, meteor showers and thousands of stars. Here is how to find darkness and make the most of it.
What light pollution does
Artificial light scatters in the atmosphere and creates skyglow — that dull orange dome you see over any town at night. Skyglow raises the brightness of the whole sky, and anything fainter than the background simply vanishes: faint meteors, the Milky Way, nebulae, and the subtle detail in star clusters. From a city centre you might see a few dozen stars; from a dark rural site, several thousand.
Light pollution has grown steadily as outdoor lighting has spread, which is why most people alive today have never seen a truly dark sky. The good news is that darkness is often closer than you think.
The Bortle scale
Astronomers rank sky darkness on the Bortle scale, from 1 to 9:
| Bortle | Sky | What you can see |
|---|---|---|
| 1–2 | Excellent / truly dark | Milky Way casts shadows; zodiacal light obvious |
| 3 | Rural | Milky Way detailed; faint meteors easy |
| 4 | Rural/suburban transition | Milky Way visible but washed near horizon |
| 5 | Suburban | Milky Way faint or lost; only brighter meteors |
| 6–7 | Bright suburban / urban | Milky Way invisible; sky glows grey-orange |
| 8–9 | City | Only the Moon, planets and brightest stars |
For meteor showers and the Milky Way you really want Bortle 4 or better. Each step darker roughly doubles what you can see.
Finding a dark site
- Use a light-pollution map. Interactive maps (such as those built on the World Atlas of Artificial Night Sky Brightness) colour-code darkness so you can spot the nearest dark zones — often just beyond the suburbs, or on the far side of a hill from town.
- Put terrain between you and the glow. A ridge, forest or valley that hides a town's lights makes a big difference even at moderate distance.
- Favour higher, drier spots. Less haze and moisture means a more transparent sky. Coastlines and mountains often have darker skies than inland plains near cities.
- Consider certified Dark Sky Places. Organisations such as DarkSky International certify reserves and parks that protect their night skies; these are reliably excellent.
The Moon is light pollution too
Even in a perfectly dark location, a bright Moon floods the sky with light and hides faint objects. For deep-sky and meteor watching, plan around the Moon: aim for the week either side of new moon, or for hours when the Moon has set. Our meteor shower calendar shows the moon phase for each 2026 shower for exactly this reason, and moon phases explained covers how to predict when the Moon is out of the way.
Protect your night vision
Getting to a dark site is wasted if you keep blinding yourself. Night vision takes 20–30 minutes to build and a second to lose:
- Use a red torch, or your phone's red-light mode, and keep it dim. Red light barely affects dark adaptation.
- Avoid looking at white phone or car screens. If someone arrives with headlights on, close your eyes until they are off.
- Be patient. The sky you see after half an hour of proper dark adaptation is a different, far richer sky than the one you saw when you arrived.