From SPTelescope https://twitter.com/SPTelescope on Twitter: Double sundog around SPT, captured by Amy Bender. Sundogs are the South Pole equivalent of rainbows, except they are caused by ice-crystals in the atmosphere refracting the sun and creating a circular ring the sun (which is shadowed by SPT here). # # # https://twitter.com/SPTelescope/status/1071696525649166336/photo/1 https://chirp.cooleysekula.net/attachment/53091