The Harvard-Smithsonian Center for Astrophysics in Cambridge sponsors a variety of free programs for the public. Among these events are Observatory Nights on the third Thursday of the month, specially scheduled Kids Academy, Sci-Fi Movie Nights, and Star Parties.

These events--unless otherwise noted--are held in Phillips Auditorium (at the rear of the CfA complex near Madison Street and large parking lot), 60 Garden Street, Cambridge, about 1 mile west of Harvard Square. Parking lots marked for Observatory Staff are open to the public on event nights. No reservations are necessary, but seating is limited to the auditorium's capacity. Admission is free.

Monthly Observatory Night Thursday, May 17, 7:30 pm: "Mercury, Venus, and the Dance of the Planets," Owen Gingerich, CfA
For all of us, it's now or never to see Venus silhouetted against the face of the sun. On June 5 the goddess will transit the sun, a phenomenon not to be repeated until 11 December 2117. First observed by Jeremiah Horrox and his friend William Crabtree in 1639, the subsequent transits in 1761, 1769, 1874 and 1882 brought about major international competition to observe this rare event. There is the pathos of Le Gentil, clouded out in India after an eight-year wait, and the triumph of Captain James Cook who discovered eastern Australia as "technological fallout" from his successful expedition to the Pacific. We'll also discuss the more frequent transits of little Mercury as it, too, marches across Apollo's disk.
Watch it live: RealPlayer

See the last Venus transit of the 21st century Tuesday, June 5, 6:00 pm
In 2004 we were treated to a sunrise view of Venus crossing the disk of the sun. On June 5th, we will enjoy a sunset Venus transit. If you miss this one, you won't get another chance to see it until 2117 - and that's a very long time to wait. The Center for Astrophysics will hold a special rooftop viewing of the Venus transit beginning at 6:00 pm. The transit will be visible from 6:03 until the sun sets at 8:19. Viewing is weather-dependent so call 617-495-7461 to check for cancellation.

For more information, including accessibility, or to sign up for the events mailing list, call the Public Affairs Office, (617) 495-7461 or email pubaffairs@cfa. Please request sign-language interpretation at least 2 weeks before the event. Current sky information is available.

The CfA is easily reached by public transportation. From the Harvard MBTA Station (Red Line), take any bus or trackless trolley going west on Concord Avenue (Arlmont Village and Belmont Center buses, Huron Avenue trolleys) and get off at "Observatory Hill."