The legendary Rome halo displays.

@article{Tape2008TheLR,
  title={The legendary Rome halo displays.},
  author={Walter Tape and Eva Seidenfaden and Gunther P. K{\"o}nnen},
  journal={Applied optics},
  year={2008},
  volume={47 34},
  pages={H72-84}
}
The two Rome halo displays of 1629 and 1630 are prominent in the early halo literature, and the 1629 display is still cited today for having contained a 28 degrees circular halo. We have examined seventeenth century correspondence and publications in order to learn as much as possible about the existing documentation of the two displays. We find the documentation to be too weak to support a definitive interpretation of either display, and we see little evidence for a 28 degrees halo or for… CONTINUE READING