Imagine going back thousands of years and showing off the cool astronomical functions of your smartphone. It can tell the date and time with incredible accuracy. It can pinpoint your location. It can even pull up a map of the stars, tell you the phases of the moon, and predict the next major astronomical event.
These ancient people would be amazed, right? It turns out, they probably wouldn't be all that impressed — because they could do all of those things, too.
