A children's book called "
You Will Go to the Moon." It wasn't quite sf in the traditional sense, but it was written in 1959 and "predicted" that such a trip would one day become routine, showing a family taking a rocket up to a wheel-shaped rotating space station, etc.
Trouble is, I read it when I was five years old. I knew that *everyone* couldn't go to the moon on a routine basis as shown in the story, but didn't grasp that it was entirely fiction. My dad had previously worked on the Mercury and Gemini programs but left Houston for another job. He was all excited the summer of 1969, setting up a movie camera to film the actual moon landing broadcast on tv. I couldn't understand why he was all hyped about it since I thought we'd already been to the moon.