by Charles Keenan
Basilica of St. Peter. Credit: Wiki Commons.In a surprise announcement this morning, Pope Benedict XVI announced his intention to resign the office of the papacy effective at 8:00 p.m. on February 28. Per the Vatican's official announcement, Benedict declared to the cardinals gathered in consistory that given his advanced age (the pope is 85 years old), he feels he lacks the physical strength to continue fulfilling the duties of the papal office.The announcement took the world, including those at the Vatican, by surprise -- a "bolt of lightning from a clear sky," one cardinal reportedly remarked. Papal resignations are not unprecedented, though they have proven extremely rare. Along with death, resignation is one of the two ways the papal office can be vacated according to canon law. Benedict will be the first pope to resign in nearly six hundred years, making his announcement all the more remarkable.