If you’re into satellites and space, it’s fascinating to leverage two line element data sets (TLEs) so that you can determine the approximate position of an orbital vehicle at a given point in time. The public data is slightly fudged to reduce precision and accuracy. I’d recommend checking out
http://celestrak.com/ and
https://www.space-track.org. There’s a company called AGI that has nice SDKs for visualizations. NASA WorldWind is also great for visualizing orbital positions. In a past life, I used these tools quite a bit.