The York County Astronomical Society (YCAS) will offer programs to the public on Saturday, Dec. 7, at the planetarium in the York Learning Center, 301 E. Sixth Ave., York.

Programs suitable for children will be "One World, One Sky: Big Bird's Adventure" at 2 p.m. and a new program, "Mars: The Ultimate Voyage," at 3:20 p.m. Older viewers are invited to attend "Forward! to the Moon" at 7 p.m. and "Two Small Pieces of Glass" at 8:20 p.m. StarWatch programs will take place at 2:40 and 7:40 p.m.

There is an admission fee, with a discount for children and seniors. The fee will also be reduced when attendees view a second or third show. Cash and most credit and debit cards are accepted.

Private show reservations are available for groups of up to 60 people.

For more details about these programs, visit http://www.astroyork.com.