An educational observatory includes a dish-shaped base member of thermoplastic material formed with circular sidewall openings with recessed and reinforced sockets for accommodating transparent vials which may be detachably secured to these sockets. Each socket has a flange with a radial length greater than the thickness of the sidewall for bonding to the inside of the sidewall. The socket forms a seat for one end of the vial, and the ridge means between the sidewall opening and vial seat engages lip means on the vial to prevent its accidental removal from the socket. A transparent hood matingly engages an edge portion of the circumferential wall of the dish-shaped base member.
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