The autumn night sky: what to point out from a British back garden

By the second week of October the sky is properly dark well before bedtime, and the summer stars have given way to the autumn ones. If you have a few people standing in the garden with you, the hard part is not finding something worth looking at. It is getting everyone to look at the same star at the same moment.

A green beam fixes that. Build the evening around four large shapes rather than faint objects, point them out in a fixed order, and use your hand to measure the gaps between them. No telescope, and no names to learn in advance.

Start with your eyes, not with the sky

The thing that makes the most difference costs nothing: waiting. Take a group straight from a lit kitchen into the dark and they see a handful of stars and lose interest in five minutes.

Dark adaptation runs on a pigment called rhodopsin, and according to the US National Park Service it takes from 20 to 40 minutes for people to start benefiting from it. A few seconds of bright light undoes it. Deep red light does not, which is why red torches are standard kit outside.

The Royal Observatory Greenwich puts the practical minimum at 15 minutes and says to leave the phone alone out there. Spend the wait on whatever is bright enough to show straight away. This year that is Saturn, which the Royal Observatory notes reached opposition on 4 October, meaning it sits directly opposite the sun and looks especially bright to us.

Green is the colour to trace with: the eye picks up 532 nm more readily than the same power in red or violet, as our guide to which laser pointer colour to choose explains.

When it actually gets dark in early October

Early October is the first stretch of the autumn where full darkness arrives before most people go to bed, and without the cold of December. On 1 September in London, astronomical darkness does not begin until 21:52. By 1 October that has moved to 20:30, and on 8 October it is 20:14, with sunset at 18:24.

That is the useful gap. Step outside at eight, spend twenty minutes letting your eyes adjust while you look at Saturn low in the south, and you are running the tour under a dark sky by half past eight.

After the clocks go back on 25 October the times collapse: darkness begins at 18:27 on 1 November and 17:56 on 1 December. Earlier in the evening, but before dinner rather than after it, and with November weather attached.

Measure the sky with your hand

Distances in the sky are angles, and you already carry the ruler. The Chandra X-ray Center gives the two measures worth memorising: at arm’s length, your little finger is about 1 degree across and your fist about 10 degrees.

Hand that to a group and the tour changes character. Instead of “over there, near the bright one”, you say “two fists up and slightly left from the corner star”, and everyone arrives at the same patch of sky. The hand gets them there; the beam confirms it.

Hand at arm’s length	Angle	What that covers this autumn
Little finger	About 1 degree	The unit the rows below are built from
A bit less than a fist	About 7 degrees	Mirach up to the Andromeda Galaxy
One fist	About 10 degrees	Two thirds of one side of the Great Square
One and a half fists	About 15 degrees	One full side of the Great Square of Pegasus
Two fists	About 20 degrees	The diagonal of the Great Square

The degree figures for the Great Square and for Mirach come from Astronomy Now and BBC Sky at Night Magazine, both cited in the next section, converted into fists with the Chandra measures.

The tour, shape by shape

Run it in this order and each shape hands you the next. Everything here is a pattern of bright stars, so it survives a garden with neighbours’ lights on.

1. The Summer Triangle, still overhead

Start with what people can see the moment they walk out. Three bright stars sit high overhead on an October evening, forming a wide triangle carried over from the summer. It needs no dark adaptation at all, and it gives the group the idea that a shape can have a name.

2. The Great Square of Pegasus

Swing east and south from the Triangle and you meet a large, almost empty square of four stars. According to Astronomy Now, the Great Square spans roughly 15 degrees along each side and about 20 degrees along the diagonal, so one and a half fists on a side and two fists corner to corner.

Its north-eastern corner is Alpheratz, the brightest star of Andromeda rather than of Pegasus, assigned to that constellation when the boundaries were defined in 1922. Trace the square, then park the dot on that corner, because the rest of the evening starts there.

3. The W of Cassiopeia

Turn north and find the five stars that make a flattened W. It is a landmark: with Cassiopeia and the Great Square, a group has the two ends of the autumn sky and everything else sits between them.

4. The Andromeda Galaxy, the one to finish on

From Alpheratz, run the beam along the two chains of stars heading north-east until you reach Mirach, the brightest star along the way. BBC Sky at Night Magazine puts the galaxy about 7 degrees, a bit less than a fist at arm’s length, above Mirach.

People see a small smudge, not a spiral, which is why you tell them what it is. NASA gives Messier 31 a distance of 2.5 million light-years and an apparent magnitude of 3.1, and notes it shows to the naked eye even under moderate light pollution.

1. Trace, do not hold. Draw the outline and switch off between targets, so everyone’s dark adaptation survives the tour.
2. Name the corner before you move. Park the dot on Alpheratz, say the name, then start the hop from a star the group has already found.
3. Count in fists out loud. Longer arms come with bigger hands, so “one fist, one and a half” means the same distance to everyone.
4. Come back to the smudge at the end. Eyes that have been outside half an hour see more of the galaxy than eyes five minutes out.

October’s meteors: Draconids first, Orionids later

October gives you two showers at opposite ends of the month, and the first suits a garden group far better than the second. According to the Royal Observatory Greenwich, the Draconids are active from 6 to 10 October, peak on 9 October at about 10 meteors per hour, come from Comet 21P/Giacobini-Zinner and radiate from Draco.

Two things make them group-friendly. They are seen in the evening after nightfall rather than in the small hours, and in 2026 the thin waning crescent moon rises just before dawn, so the sky stays dark. A tour on 8 or 9 October gets the shapes and the meteors in one session.

The Orionids are the richer shower but the later night. The Royal Observatory has them active from 2 October to 7 November, peaking on 21 October at about 15 meteors per hour, with material from Halley’s Comet entering the atmosphere at around 41 miles per second. The two Taurid streams sit at about 5 an hour each, the southern one peaking on 10 October and the northern one running from 20 October to a peak on 12 November.

Point out the radiant once so people know which way the trails run, then pocket the pointer. Meteors are caught with peripheral vision across a wide patch of sky, not by six people staring at one dot.

What a back garden can honestly show

Most British gardens are not dark, and a tour built on shapes is the answer to that rather than a compromise. A security light two doors down, a street lamp and the glow of the nearest town take the faint stars out first and leave the bright ones where they were.

Every shape in this tour survives that, because the Summer Triangle, the Great Square, the W and Mirach are all bright stars. Only the Andromeda Galaxy asks anything of the sky, and NASA’s note about the naked eye under moderate light pollution covers that.

Two moves buy you a lot: switch off the garden and porch lights half an hour before, and stand in the shadow of the house so no lamp is in anyone’s view. For a club or a class rather than a family, the same technique is covered in our notes on a laser pointer for presentations and teaching.

Frequently asked questions

What stars can I see tonight in the UK?

On an October evening: the Summer Triangle overhead, the Great Square of Pegasus south and east, the W of Cassiopeia in the north, and Mirach with the Andromeda Galaxy about 7 degrees above it. Saturn is the bright object low in the south, having reached opposition on 4 October according to the Royal Observatory Greenwich.

What constellations can you see in the UK in October?

The autumn set is Pegasus, Andromeda, Cassiopeia and Perseus, with Cygnus, Lyra and Aquila still high from the summer. Work outwards from the Great Square of Pegasus, which Astronomy Now gives as roughly 15 degrees on a side, and the others are all within a few fists of it.

Can you see the Andromeda Galaxy with the naked eye in the UK?

Yes, from most gardens. NASA lists Messier 31 at apparent magnitude 3.1 and notes it shows to the naked eye even under moderate light pollution. Expect a faint oval smudge, not a spiral. Look slightly to one side of it rather than straight at it, and give your eyes 20 minutes outside first.

How do you find the Great Square of Pegasus?

Face south and east in the early evening and look for four stars marking a large, mostly empty square. Astronomy Now gives it about 15 degrees per side and about 20 degrees on the diagonal, so one and a half fists per side at arm’s length. The emptiness inside is the giveaway.

How long does it take for your eyes to adjust to the dark?

The US National Park Service says people start benefiting from dark adaptation after 20 to 40 minutes, because the pigment rhodopsin needs that long to build up. A few seconds of bright light resets it, though deep red light does not. The Royal Observatory Greenwich suggests 15 minutes as a working minimum.

Where to start

Pick an evening in the first half of October, have people outside by eight, and do nothing for twenty minutes except look at Saturn and talk. Then run the four shapes in order, measure the gaps in fists and finish on the Andromeda Galaxy, so the evening ends on 2.5 million light-years rather than on a constellation name.

There is more on beam choice and night use in our guide to a green laser pointer for stargazing, the rest of the range is in the shop, and lead times are on the delivery page.

Tim Buikema runs Emax Laser Pointers, the UK shop of Emax Lasers. He has supplied laser pointers to farms, marinas and facility managers since 2011 and opened the UK shop in 2017.