/sci/ - Science & Math

You can find one of these on Amazon, here's a link: https://www.amazon.com/Estes-302232-Alti-Altitude-Finder/dp/B0004HJO9M/ref=sr_1_fkmr0_1?ie=UTF8&qid=1532990787&sr=8-1-fkmr0&keywords=estes+motor+angle+measurer

Get a few friends on Discord or Skype or whatever who live some thousands of miles apart, and take some observations of the moon, north star, handle on the end of the big dipper, etc.

Keep in mind you're not lying all on a 2d plane, then see how your model compares with a round Earth model. The math gets somewhat complicated, though, but perhaps you could compare it to what you get in some program like Celestia and realize that the 3d world Celestia paints is a perfectly accurate predictor of what you observe with the altitude of Celestial objects: https://celestia.space/