Submitted by Sabre-Tooth-Monkey t3_zyesvt in askscience
Choralone t1_j27c5yb wrote
Reply to comment by alleyoopoop in How fast does the Milky Way spin? How far does Earth move through space in a year? by Sabre-Tooth-Monkey
Those are from density waves, which I believe have a different period than orbital.
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