Feature request: Any chance of a "back in time" slider? I'm going camping this weekend for a bike race in Utah. Even there I don't recall being impressed by the

Feature request: Any chance of a "back in time" slider? I'm going camping this weekend for a bike race in Utah. Even there I don't recall being impressed by the stars there, compared to my childhood in Kansas, where I could see the Milky Way from my front yard. It would be interesting to compare this to what it looked like 30 years ago.