The Harvard-Smithsonian Center for Astrophysics in Cambridge sponsors free programs for the public on the third Thursday of every month (excluding June, July, August, and December). "Observatory Nights" feature a nontechnical lecture and telescopic observing from the observatory roof if weather permits. The lectures are intended for high-school age and older audiences but children are also welcome. Seating is limited and available on a first-come basis. Doors open at 7:00 pm; programs begin at 7:30 pm. Parking is free.
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