[TXnMA]

I agree. Celestia stays on my desktop. It is used often, when my granddaughters ask, "Granddad, What is that bright star we can see right over the treetops?"

Our front door looks right out on the eastern ecliptic -- so, usually it's a planet (Mars, lately...)

[zeugma]

One of the coolest features of Celestia IMO, is that it’s the first program that I’ve ever seen that really gives you a feel for the scale of space. Limit yourself to the speed of light, make a tour of the solar system and you’ll see what I mean. :-) I recently flew to Alpha Centauri at 1AU/sec. Even at a ridiculous speed like that, it still takes freaking forever!