PennWest Department of Chemistry, Mathematics, and Physics will present Season of Light at 7 and 8 p.m. Dec. 1 in Peirce Planetarium, located inside Grunenwald Science and Technology Center on the Clarion campus.

This presentation, which is free and open to the public, traces the history and development of many of the world’s most endearing holiday customs, from sparkling Christmas tree lights to burning the Yule log, or even kissing under the mistletoe. The show recounts some of the religious rituals practiced around the world during winter solstice. Guests will learn some of the brighter winter constellations and find out why we have seasons.

The 40-minute show ends with possible astronomical explanations for a “Star over Bethlehem.” Season of Light is culturally inclusive, musically satisfying and soothing as a warm drink on a cold winter’s night. For parents of young children, nothing is given away regarding the man in the white beard and red suit.

The monthly Stars Over Clarion program, also free and open to the public, is set for 7 and 8 p.m. Dec. 7 and 8. The 50-minute show highlights the month’s brightest stars and most important celestial happenings.

The planetarium is handicapped-accessible. Parking is available in Lot 12, behind Marwick-Boyd Fine Arts Center, and Lot 11, across from Tippin Gymnasium. Doors open at 6:30 p.m.