Lars Gislén and Jan O. Mattsson Observations and Simulations of some Divergent-Light Halos Applied Optics 42, 4269-4279 (2003) Abstract: We deal with some halos generated by the divergent light from a nearby source. After discussing how the divergent light transforms some halo features, we give an outline of a method of handling the simulation of a divergent-light halo. The simulation method is then successfully tested on some well-documented halo observations. We also present a 'simulation atlas' that shows halos produced by crystals of different shapes and for different light-source elevations and distances between the observer and the light source. The simulation method also admits a three-dimensional visualization of the phenomena. LU TP 03-20