Tallest Pink, Tallest Indigo · 6:23pm
At the climax of Crystal Empire Pt 2 (when everyone gets new hairdos) Canterlot appeared with the stars out and apparently late at night. With Sombra and the protective dome messing with things, it's hard to tell the time of day in the Empire, but it seems to be daytime or at least dusk at the same moment. Which implies timezones. Which implies "raising" the heavenly bodies is a constant process or a PR masterstroke.
The latter implies that the RPS are basically The Tallest from Invader Zim.
Which I am pretty okay with.