With the month of August, the appointment is renewed with "A night with Sirius", an initiative by Sirio Aps which offers a rich calendar, an opportunity to observe the sky to learn about it, with Professor Niki Rizzi. These are the dates scheduled for August 2021: 6, 10, 13, 17, 19, 24, 27, 31. Each appointment will take place in two shifts: briefing at 20:00 | observation starts at 20:30 briefing at 21:30 | observation starts at 22:00 To participate, you must book at segreteria@grottedicastellana.it or by phone at 080.4998211, ticket cost € 7 per person (free for children under 8 years old), briefing at the “Franco Anelli” Speleological Museum. Observation will be possible only in favorable weather conditions. If unfavorable weather forecasts are ascertained, the evening will be postponed by telephone at least 12 hours before the event.