A Beginner's Guide to Naked-Eye Astronomy

You do not need a telescope to enjoy the night sky. With a dark location, a little patience and well-adapted eyes, you can see planets, star clusters, satellites and even a neighbouring galaxy.

Let your eyes adapt

Your eyes become much more sensitive in the dark over time. Pupils widen within seconds, but the deeper adaptation of the retina takes around 20–30 minutes.

• Avoid bright screens once you are outside; if you need light, use a dim red light.
• Give yourself at least 20 minutes before judging how many stars you can see.
• If you wear glasses for distance, wear them — stars are points of light, and sharp focus makes faint ones easier to spot.
• Avoid tinted or photochromic lenses at night.

Use averted vision

The centre of your vision is excellent for detail but less sensitive in very low light. Looking slightly to one side of a faint object — known as averted vision — often makes it easier to see.

What to look for

• The Moon: craters and dark plains are visible to the naked eye, especially near the terminator line between light and shadow.
• Planets: Venus, Jupiter, Mars and Saturn appear as bright points that do not twinkle as much as stars. They move slowly against the background stars over weeks.
• The Pleiades: a small, tight cluster of stars, easy to find in autumn and winter skies in the northern hemisphere.
• The Milky Way: a soft band of light visible from dark sites away from city lights.
• The Andromeda Galaxy: from a dark site, a faint smudge — light that left it around 2.5 million years ago.
• Satellites and the space station: steady moving points of light shortly after sunset or before sunrise.
• Meteor showers: several annual showers produce visible meteors; no equipment needed.

Never look at the Sun

Never look directly at the Sun, including during a partial eclipse, with or without sunglasses. Ordinary sunglasses do not provide enough protection. Only use certified solar viewing filters designed for that purpose.

Plan your night

Check the weather and Moon phase — a bright Moon washes out faint objects. A free star-chart app (used on its night mode) helps you identify what you see. Bring a warm layer, a reclining chair and patience.

Clear skies — and if your distance vision has felt less sharp lately, it may be worth booking an exam with an eye-care professional before your next stargazing trip.