I realise it's been quite a long time and you probably know how to do this already, but just in case, LuaPlayer::open_factoriopedia_gui is used to open Factoriopedia to a given LuaPrototypeBase like this:

player.open_factoriopedia_gui(prototypes.space_location["nauvis"])

As for alternate click functions... maybe you could toggle a coloured display, so the time turns green when the planet is generating power (daytime for solar panels on Nauvis, nighttime for lightning on Fulgora).

Thank you for the hint! That function didn't exist yet when I created the mod, and apparently I didn't notice it in the changelogs or didn't think of this mod when I read it. ^^ I'll implement that in the next update.

About the colored display, I had some similar ideas like showing a thunderstorm warning icon on Fulgora shortly before and during nighttime. A solar power indicator would be a good idea too. Not sure yet what the best way to display that would be, coloring the text definitely would be an idea, but it could also be confusing/inconsistent when considering Fulgora: Should it be consistent with other planets and display green during the day? But you usually generate power during the night, so inverting it might make sense - but also, nighttime is dangerous, so it should be red to signalize danger? Very unsure about the best approach here 😅 But I might try some things out.

Thanks for the feedback! :)