The York County Astronomical Society will offer a day-long slate of free activities for children and adults and a night of Public Observing at John C. Rudy County Park for Astronomy Day, noon-3 p.m. Saturday.

Activities include:

* Radio Astronomy: Listen to the mysterious sounds of the universe using a small radio telescope.

* Solar Observing: Safely observe the Sun through various types of telescopes.

* Solar System Walk: Help build a scale model of the Solar System.

* Learn how to use your telescope: Daytime is the best for learning how to use that telescope gathering dust at home. Bring the telescope, any accessories and instructions to the observatory to get help from experienced astronomers.

Return to Rudy Park at 8 p.m. for a two-hour observing session.

The daytime program will be offered rain or shine. Solar activities will only be offered if it is not cloudy. The evening observing session will only be offered if it is clear or partly cloudy. Call the YCAS Hotline at (717) 578-9109 or check http://www.ycas.org after 5 p.m. on the day of the event if the weather is questionable.

For more information on Astronomy Day, write to info@ycas.org, visit http://www.ycas.org and click on Astronomy Day, or call (717) 578-9109.

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Astronomy Day at York County park