The times for sun rise and sun set Planetarium calculates are competely off. A: Perhaps you have confused latitude and longitude?
Q: I understand that the “Now” button should use the current time, but it doesn’t. A: Make sure you have correctly set the time zone settings in the Location screen. See here for a detailed description how the two time zone settings work. If you just want to use Planetarium for your home location, set both time zones to the same value.