diptych? new term for me, I had to look up that word. thanks.
Both the above are examples of differential rotation. Layers of our sun also rotate differentially. But it is really quite complicated on how this works on either scale (galaxy or a large storm system on our tiny planet).
Welcome to my personal blog where I share stuff that I care about - music, film, travel, life in Philly - as well as sprinkling of other random ephemera.
yvynyl is my music blog - documenting the ongoing cascade of interesting bands, great songs and music-related art I want to share.