Beneath Nancray's celestial vault, the museum will be offering its visitors an unusual experience. At sunset, on the upper part of the site, the Association Astronomique de Franche-Comté will set up a dozen telescopes and invite the curious to observe the stars.
An opportunity to meet and listen to these enthusiasts, and learn a little more about the cosmos. Those who wish will be invited to spend the night in a tent or under the stars in the museum grounds, where breakfast will be served early in the morning.

Evening program:
- 8pm-9pm: lecture
- 9pm-00am: sky observation
- 00am-9am: night at the museum, by reservation
- 7am-9.30am: breakfast (by reservation at time of registration)

Free admission for the conference and sky observation. Free but compulsory registration for overnight stay, and extra charge for breakfast.