I completely disagree with you @ehsteve, the relationship between Atropy and Us is *very* different to that of our relationship wtih NumPy and SciPy. We contribute code back to astropy, we engage with their communtity and steer their developement in ways that will benifit both projects. I think it is very important that we make this clear. As for Astropy recipricating, while the relationship may be mutually benifical we are getting much more out of it that they are.