I don’t understand how my school (P.S. 24 in the Bronx) had the budget for this, but in first grade, we had a planetarium in the back of the classroom. It was very low-tech — a simple dome with an overhead projector, and we all sat on the floor.
The teacher (a guy. Can’t remember his name. I can only go as back far back as my third grade teacher) probably taught us astronomy lessons or something, but all I remember is him pointing out Orion and then making Orion chase us, by tilting the projector so the stars touched our heads. This made us all squeal in complete delight.