Sommers-Bausch Observatory at the University of Colorado at Boulder will host a special public open house on Friday, Dec. 14, between 1 p.m. and 4 p.m., to allow visitors to safely view a partial eclipse of the sun using the observatory's solar telescope. According to Keith Gleason, a coordinator at the observatory, the moon will obscure 15 percent of the diameter of the sun at maximum eclipse, which occurs at 2:40 p.m. local time.