Scopes in the City Mon, Mar 20 2017 · 6:00 pm - 9:00 pm Exelon Observatory, 1800 N Ridgeway (3750 W) a Astronomy Join astronomers from the Adler Planetarium tonight for a special Scopes in the City viewing on the spring equinox at the Exelon Observatory. Sunset at 7:03 p.m. Mars , the Pleiades star cluster, and possibly the Orion Nebula. Weather permitting.