In "Island in the Sky", the third episode of Lost in Space, the Jupiter 2 crashes on a planet, apparently named Priplanus. For the next few episodes, it's rather clear they have not made it back into space and reached another planet between episodes. In the next two episodes, we find out Priplanus has an eccentric orbit, causing the weather, periodically, to go from extreme cold to extreme heat. This is mentioned at some point later in the first season, so it's clear they were on Priplanus for most of that time.
In the first episode of the second season, "Blast Off into Space", the Robinson's leave a planet, but it's not clear if they're leaving Priplanus or if they've been on more than one planet since "Island in the Sky". Then, several episodes later, it seems, in "Forbidden World", the Jupiter 2 is once again stuck on a planet for most, if not all of the 2nd season, until they blast off in "Condemned of Space" (the first episode of the 3rd season). During the third season, they have a mix of space bound and planet bound episodes.
Overall, how many planets did the Jupiter 2 (or the Robinsons, using the Space Pod or other means) visit?
Is there any reason to believe that they left Priplanus during the first season and landed elsewhere, or that, after landing on a planet in the 2nd season, that they left it before "Condemned of Space"?