The nights are properly dark again: Orion's public stargazing evenings are free, Bussloo is 6 euro on Fridays

Dutch summer nights never really go dark, so public stargazing evenings largely stop for the season. As autumn draws in and the sky closes earlier, the volkssterrenwachten start up again. Volkssterrenwacht Orion says exactly that on its page: kijkavonden voor het publiek zijn weer gestart, the public viewing evenings have restarted. There are roughly forty public observatories in the country and Astronomie.nl lists them all by province, but that list gives you a name and a link and states plainly that times and conditions are on each observatory's own site. That is the gap: one activity, forty places, and nowhere that puts the prices side by side. source 1

Pull two of them out and the spread shows at once. Orion is blunt about it: de entree voor een publieke kijkavond is altijd gratis, admission to a public viewing evening is always free, and only a privately arranged session for a small group of at most four carries a fee. Volkssterrenwacht Bussloo runs Friday evenings, doors at 19:00, the talk from 20:00, finishing around 22:00 with a break in between, at 6 euro for adults and 3 euro for children up to 14. No booking is needed, but the room holds about sixty and the page is explicit that vol is vol, full is full. For a family of four the sum is 0 euro at Orion against 6 × 2 plus 3 × 2, which is 18 euro, at Bussloo. Both are the same thing: someone walks you through a telescope. source 2

The ticket is not the real variable here though; the weather is. A viewing evening can be shut down by cloud, so the question is not how expensive it is but what you lose when the sky closes. On the free evening you lose the journey. At 6 euro a head, a family of four has 18 euro plus the journey riding on that night's cloud cover. That is also why the Bussloo running order is worth noting: part of the evening, the talk from 20:00, happens indoors. So the practical move is this. Find the two or three nearest you on the national list, open each site and copy down three things only: which evening, what time, how much. Then make your first attempt at a free or cheap one, and once you know whether you actually enjoy standing outside for two hours in the cold, decide whether the further one is worth the fare. source 3

• Season: summer nights are too light so the evenings largely stop; Orion's page states the public evenings have restarted.
• Roughly forty public observatories nationally, listed by province on Astronomie.nl, with no times or prices given.
• Volkssterrenwacht Orion: admission to a public viewing evening is always free; a private group of up to four pays a fee.
• Volkssterrenwacht Bussloo: Fridays, doors 19:00, talk from 20:00, ending around 22:00; 6 euro adults, 3 euro under 14.
• Bussloo needs no booking but holds about sixty people and states that once full, that is it.
• Family of four: 0 euro at Orion against 6 × 2 + 3 × 2 = 18 euro at Bussloo; the real variable is that night's cloud.

Hokimi field note: check a cloud map rather than a weather icon before setting off, because stargazing needs clear and not merely dry.