Over the years, I became a pretty good engineer, rigger, welder, and scavenger. But, the kids were no longer impressed, and if you're a teacher, you know that there has to be some level of entertainment. The cost of cool, however, was too much. I looked for options, and I found one. An LCD projector bouncing off a $25 curved security mirror. The results were a little underwhelming, but acceptable. Using Stellarium, and Celestia brought astronomy back to life in an old, obsolete planetarium.
I was okay with what I had, but a VGA projector does an okay job, but the new 4K, and soon 8K projectors will certainly rock the house. For now, I will settle with my new HD NEC
All of the following images are cellphone captures