[identity profile] peteralway.livejournal.com 2021-10-12 01:44 am (UTC)(link)
Those old-school electromechanical planetarium projectors were magical. They even had mechanical gears to point the planets. They ran on the principles of Ptolemy's geocentric cycles and epicycles, and if you set them up right, you could run them for centuries. I had the opportunity to use the one in Kalamazoo for a year or two, doing a couple of shows filling in for the regular planetarium guy.

[identity profile] fflo.livejournal.com 2021-10-12 10:49 pm (UTC)(link)
It's pretty cool-lookin' too. :D

[identity profile] peteralway.livejournal.com 2021-10-13 01:04 am (UTC)(link)
Especially in context, at the center of the dome. The new computer ones are kinda sad, though they can do a lot more now.

Peter