A small observatory built in 1978 featuring a ½-metre Cassegrain reflector telescope. Run by the nearby H.R. MacMillan Space Centre.
Shawn goes into the observatory and chats with the one remaining astronomer about his late partner in episode 1x10 "From the Earth to Starbucks".
Jack and Teal'c visit an observatory to confirm the first solar flare indicated on the note from General Hammond in episode 2x21 "1969".
A man notices a Tomorrowland pin while working in an observatory.
From episode 5x19 "Hearts of Steel".
Gus takes Shawn to a night at the observatory and Gus attracts the attention of Selene.