Planetarium is closed for renovation until May 2015 after December 2014. -------- The Robert T. Longway Planetarium is one of the largest and best equipped in the country. Designed by the Detroit architectural firm of Smith, Hinchman and Grylls, the structure consists of steel-reinforced concrete, measures 88 feet in diameter and 40 feet in height. The inner dome, which houses the projector, is 60 feet in diameter. There were originally 292 seats. The inner dome is constructed of thin strips of perforated aluminum attached to a geodesic dome super- structure and serves as the screen for the planetarium projector. The planetarium was designed to catch the viewers’ eye both inside and out. The waterproof surface coating on the outer dome contained Carborundum chips which sparkled in the sunlight or when spotlights were fixed on the dome at night. The reflecting pool, which adjoined the planetarium, contained a dozen spray jets. Colored lights played on the sprays at night. By looking into the pool, one could see the dome and its reflection formed a complete sphere.