Discuss what a planetarium is and how it differs from a telescope. Explain that you can use a planetarium during the day. Terms and Concepts to study before bringing your class to the Planetarium 1. The Roth Planetarium has a Spitz 373 projector which has a bright xenon bulb inside. The bulb shines though a starsphere which has 1,000 holes drilled in it in the patterns of the constellations that we see in the sky.
Brighter stars have larger holes in the starsphere.
The dome of the planetarium represents the sky. The bottom of the dome represents the horizon. Preparing your class for a visit to the Planetarium Teachers please go over the material below which would be appropriate for your class before you bring your class to the planetarium. Light year is the distance that light travels in one year. How to measure angles .