Basically what's being depicted here is that Jadite, Zoisite, and Kunzite are testing the credibility of Nephrite's methods of astrology. Apparently, Jadite's the only one who takes this seriously. Seriously, I could have answered that question for you, dude.
I assumed it would be kind of bright in his planetarium, hence the shading techniques. I kinda wished I could've made the background dark, but I knew that would take a lot of time, and I have to get up early in the morning as it is. But I think I'm finally starting to get the hang of drawing the Shitennou Zoisite's face looks a little weird (although it can't possibly look any worse than Buena Vista's "Green Eyed Monster" cover art), but other than that, I like how it came out. If only it were colored T.T
Sailor Moon © Naoko Takeuchi
*Stars doing the the star seeing thing*
Stars: He dooooooo