I worked on code to make figures to go in the captions of the Sloan Atlas. I discussed reincarnating The Thresher with Patel and Federica Bianco (NYU), who wants to use it on her Lucky Imaging data. Vakili and I asked Foreman-Mackey to teach Vakili how to access and use SDSS Stripe 82 data on stars, to build a prior PDF for the point-spread function. I wrote text on my ideas for improving aperture photometry. I got so engrossed in the latter writing that I missed my subway stop on my way up to Columbia and ended up having to walk 17 blocks back downtown for #NYCastroML.