From SPTelescope http://status.hackerposse.com/url/18106 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). #sundog #Antarctica #southpole http://status.hackerposse.c…