Sri Yukteswar discovered the mathematical application of a 24,000-year equinoctial cycle to our present age. 4 The cycle is divided into an Ascending Arc and a Descending Arc, each of 12,000 years. Within each Arc fall four Yugas or Ages, called Kali, Dwapara, Treta, and Satya, corresponding to the Greek ideas of Iron, Bronze, Silver, and Golden Ages.