Stargazing in Berlin: Which Observatory Night Actually Shows You the Sky
The first clear night of October in Berlin usually catches people off guard. You come out of the U-Bahn at nine, the sky over the Spree is suddenly black instead of grey, and there is one bright steady dot low in the south-east that is clearly not a plane. That dot is Saturn, and this autumn it is the best thing in the city's sky.
Berlin is not a dark-sky city, but it has something most capitals do not: two public observatories that open their big telescopes to anyone with a €12 ticket, several nights a week, all autumn. The Archenhold Observatory in Treptower Park and the Wilhelm-Foerster Observatory on the Insulaner hill in Schöneberg both run evening viewing sessions from October to December. The trick is choosing the right night, because the Moon, the hour and the clouds decide what you actually see through the eyepiece.
Stargazing in Berlin: the two observatories that open at night
I went through the full autumn programme of the Stiftung Planetarium Berlin, which runs both observatories, and checked every evening session from 1 October to 26 December. The format is the same at both: a live-hosted session called Nacht auf der Sternwarte, 90 minutes, from age 12, €12 or €8 reduced, with two start times a night, 20:00 and 22:00.
Archenhold Observatory, Treptower Park: Thursday, Friday and Saturday nights, 42 seats a session, viewing through the 500 mm Cassegrain mirror telescope. 36 nights between 1 October and 26 December.
Wilhelm-Foerster Observatory, Insulaner: Friday and Saturday nights, 50 seats a session, viewing through the 12-inch Bamberg refractor. 25 nights in the same stretch.
Sternenkieker for kids: from 30 October, both observatories add a 18:00 session on Fridays and Saturdays for children from 8, same price, with the Moon and planets as the targets.
Both run in German, and the talk is not translated, which matters if you are bringing friends who do not speak German.
The Great Refractor on the roof of the Archenhold Observatory, built in 1896 and still movable.
Why the night you pick matters more than the observatory
Most people book whatever evening is free and then find out that the Moon was full, or that the thing they came for was hidden behind the trees. Three things change what you see, and all three are predictable.
The Moon. A full Moon is a wonderful target in its own right, but it lights up the whole sky and washes out faint galaxies and star clusters. This autumn the darkest weekends, with the Moon below the horizon at 22:00 and barely lit anyway, are 9 and 10 October, 6 and 7 November, 13 and 14 November, 4 and 5 December and 11 and 12 December. The full Moons fall on 26 October, 24 November and 24 December. A half Moon is the best of both worlds: the craters along the shadow line look almost three-dimensional.
Saturn. Saturn is at opposition on 4 October, which means it is closest and brightest for the year and up all night. The catch is the hour. In early October it is still only about 10 degrees high at 20:00, low enough to sit behind the trees around Treptower Park. By 22:00 it has climbed to about 30 degrees in the south-east. From November it stands highest in the south right at 20:00.
The clock. Clocks go back on 25 October. Before that, the 20:00 session starts in late twilight. After it, 20:00 is properly dark, and the 20:00 slot becomes the better choice for most people, especially on a work night.
My advice: in October, book the 22:00 session; from November, book 20:00. I have done it the other way round and stood on a roof at eight in early October looking at a sky that was still blue in the west.
Archenhold Observatory: the big telescope in Treptower Park
The Archenhold Observatory sits at Alt-Treptow 1, inside Treptower Park, about 12 minutes on foot from S Treptower Park or S Plänterwald. It calls itself the largest and oldest public observatory in Germany, and the building proves it before you even get inside: on the roof lies the Great Refractor, a 21-metre steel tube from 1896 that weighs 130 tonnes and is still the longest movable refracting telescope in the world.
The evening sessions do not use the Great Refractor, though. They use the observatory's 500 mm Cassegrain mirror telescope and other instruments on the outdoor terrace. On a clear night that means Saturn and its rings, the Moon's craters, double stars, and on a dark night the brighter nebulae and galaxies.
The practical points:
Thursday is the quiet night. Only Archenhold runs on Thursdays, and on 27 September the Thursday 22:00 sessions in October still had almost every seat free.
Dress for outside. Part of the session happens in unheated rooms or on the open terrace. In November that means a proper coat, hat and gloves.
If it is cloudy, you still get a show. The observatory moves the group into its planetarium or the Einstein-Saal and shows the sky projected instead.
The Archenhold Observatory seen from above, deep inside Treptower Park with the Spree behind it.
If you want to turn it into an evening, the park walk from the S-Bahn along the river is part of the fun. My Treptower Park guide covers the rest of the park.
Wilhelm-Foerster Observatory: the dome on the rubble hill
The Wilhelm-Foerster Observatory stands on top of the Insulaner, a hill in Schöneberg built from wartime rubble, at Munsterdamm 90. From S Priesterweg it is a walk of about 12 minutes, the last part uphill. Its main instrument is the Bamberg refractor, a 12-inch lens telescope in the big dome, and on a clear night it gives crisp views of Saturn and the Moon.
It opens on Friday and Saturday nights only, with the same 20:00 and 22:00 start times. The planetarium at the foot of the hill is closed for a long renovation, so there is no indoor dome here at the moment.
The hill is the reason to choose it. You stand above the surrounding streets with an open view to the south, where Saturn sits this autumn. It is also the easier trip from Steglitz, Tempelhof or Friedenau.
The main dome of the Wilhelm-Foerster Observatory on the Insulaner, where the Bamberg refractor sits.
Clear sky, full Moon or clouds: what each night gives you
It helps to know what a good session looks like before you book, so you are not disappointed by the wrong kind of night.
Dark night, Moon down: the best nights for faint things. The hosts go for star clusters such as the Pleiades, the Andromeda Galaxy and planetary nebulae, plus Saturn.
Half Moon: the Moon becomes the star. Craters and mountain shadows along the terminator are the most detailed thing you will ever see through a telescope in the city.
Full Moon: bright and flat, fun for kids, less so for anyone hoping for galaxies.
Cloudy: you get the indoor programme. Tickets are for the event, not for clear weather, so check the forecast on the morning and pick another date if you are flexible.
A full Moon over the Bode-Museum and the TV Tower. On nights like this, the Moon is the whole show.
My advice: if you only go once, go on a half Moon with Saturn up. You get the two most striking views a Berlin telescope can give, and the sky is dark enough for one or two star clusters as well.
If you want it in English, or the weather will not play
The telescope nights are in German, but the Stiftung Planetarium Berlin runs two English-language dome shows that work well as a first step or a cloudy-night plan:
Starry Night, a live-hosted 60-minute tour of the current Berlin sky: at the Archenhold Observatory on Friday 9 October and Friday 13 November at 18:30 and Saturday 19 December at 17:00, and at the Zeiss-Großplanetarium on Prenzlauer Allee on 10 October, 23 October, 14 November, 28 November, 12 December and 22 December.
Encounters in the Milky Way, a dome show about the Milky Way, at both venues several times this autumn.
Both cost €12 or €8 reduced and happen under the dome, not at a telescope. My move would be the Archenhold double on Friday 9 October: Starry Night at 18:30 in English, then the 22:00 telescope session on a moonless night with Saturn a week past opposition.
The Zeiss-Großplanetarium on Prenzlauer Allee, where most of the English-language sky shows run.
Tickets, kids and getting home
Tickets are sold on the Stiftung Planetarium Berlin website and at the box office, which opens 30 minutes before each session. A few rules are worth knowing:
Family tickets (€31.50 for two adults and up to three children), the Berliner Familienpass discount and wheelchair places are sold only at the box office or by phone, not online.
Reduced €8 applies to under-18s, pupils, students and trainees with proof.
The Sternenkieker kids' sessions at 18:00 finish around 19:30, which works on a school night. The adult sessions are 12+.
The 22:00 session ends at about 23:30. From Treptower Park the S-Bahn keeps running late on Fridays and Saturdays, and on weeknights the night network takes over after about half past midnight. If you are cycling, this is exactly the time of year when your bike lights start to matter. And if you are planning several indoor evenings as the season turns, my note on what closes in Berlin in winter helps you see what is still open.
For families, the kids' sessions pair well with the rest of the Berlin with kids ideas for dark afternoons.
The night I would book
If I could book only one night this autumn, it would be Saturday 14 November at 20:00 at the Wilhelm-Foerster Observatory: the Moon has already set, Saturn stands about 36 degrees high in the south, the clocks have gone back so 20:00 is fully dark, and the hill gives you the widest horizon in the city.
One simple move for this week: open the sky board above, find a Friday or Saturday where the cell is dark and both markers are lit, and book that session before the 20:00 seats go.
Image credits
Source and licence details for the 3 photographs used in this article.
The Archenhold Observatory in Treptower Park from above: Toniklemm, CC BY-SA 4.0, via Wikimedia Commons.
A full Moon over the Bode-Museum and the TV Tower: Vollformat Berlin, CC BY-SA 2.0, via Wikimedia Commons.
The Zeiss-Großplanetarium on Prenzlauer Allee: Joe Mabel, CC BY-SA 4.0, via Wikimedia Commons.