After a few minutes of conversation, Blanton demonstrated to Willman and I that even though the SDSS data are not designed to deal with crowded fields well, they can be used to measure the proper motions of halo globular clusters. Koposov, Rix, and I demonstrated that the proper motions can be used statistically when we looked at the GD-1 Stream, but then I left this subject behind, even though globular clusters are actually much easier to measure than the GD-1 Stream. This relates to my repetitive rant that there are many great measurements waiting to be made in existing data.
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