GalSim Roman module diagrams
The following diagram illustrates the various coordinate systems used to describe Roman Space Telescope and the wide-field imager for Cycle 6, which is relevant for GalSim v1.5 and later:
The following diagram was provided by Jeffrey Kruk to illustrate the various coordinate systems used to describe Roman Space Telescope (then WFIRST) and the wide-field imager for Cycle 5, which is relevant for GalSim v1.4:
