I logged in just to answer this:
Stellarium
When it comes to stargazing and learning more about the night sky, there is hands-down no better program. It’s available on PC (windows/Mac/Linux) as well as mobile platforms. I used it for months for free before I paid for the premium sub, and the premium sub actually feels additive rather than just gatekeeping essential features. Plus, it’s pretty cheap and you can choose to just buy a lifetime pass for $20 and skip the sub. It’s the only app I’ve ever been happy to subscribe to.
You’d still have wealthy Christians being like “okay, but what did Jesus mean by this?”