EMDSO is an acronym for Eastern Missouri Dark Sky Observers. We are a group of amateur astronomers interested in sharing our interest in astronomy with each other and the general public.

We have our monthly business meeting at various locations in the area of Union or Washington, Missouri. Frequently, they are at members homes or the public library.

On the fourth Saturday during the months of March through October, we host a public open telescope night at East Central College's Observatory located just west of the water tower. Telescope observing begins just after dusk and continues as long as the club volunteers wish to stay.