Michelle Brown and Andy Stillinger calculate the tilt of the Earth's axis by using height and shadow length at the South Pole on winter solstice.
The Live from IPY event was held on May 5, 2008 with Katie Pena and the research team on the Nathanial B. Palmer Icebreaker in the Drake Passage between Chile and Antarctica. About 160 students and adults participated from about 8 different groups.