Hi all: A quick question if anybody knows how to help. I need an approximate moon position on sky, within a degree is fine, I'm using get_moon and then trasnform_to(AltAz(...)). The issue is that it runs fine when running a single process, but when running in MPI mode, it seems that on our cluster, when hundreds of processes try to get the cached ephemerides, they fail so they all start to download a new file, then they can't acquire lock and things to sideways. I tried disabling it using iers.conf.auto_download = False , but this makes it even slower, since it now seems to want to open a certain Table every time I call get_moon so it becomes really really slow (as in seconds for a moon position). Any ideas on how to fix this? Ideally I would just like to tell it, ignore all the subtleties and give me something very approximate.