Circle of Animals/Zodiac Heads 1860 during the Second Opium War, at which time the fountainheads were looted. They were originally made by an Italian Jesuit, Giuseppe Castiglione. In May 2015, Sean Parker paid US$4.4 million at Phillips for the small (gold) version of the 12-sculpture work by Ai Weiwei. In June 2015, a large (bronze) version sold at auction for $5.4 million. Circle of Animals/Zodiac Heads Circle of Animals/Zodiac Heads is an artwork by Chinese contemporary artist and political commentator, Ai Weiwei. The work comes in a small (gold) and large (bronze) version. Created in 2010, the zodiac heads (a Rat, Ox, Tiger, Rabbit,
Ancient Greek astronomy Perga (c. 262 BC–c. 190 BC) responded by introducing two new mechanisms that allowed a planet to vary its distance and speed: the eccentric deferent and the deferent and epicycle. The deferent is a circle carrying the planet around the Earth. (The word "deferent" comes from the Greek fero φέρω "to carry"and Latin "ferro, ferre", meaning "to carry.") An eccentric deferent is slightly off-center from Earth. In a deferent and epicycle model, the deferent carries a small circle, the epicycle, which carries the planet. The deferent-and-epicycle model can mimic the eccentric model, as shown by Apollonius' theorem. It can also