Do you know when Easter is? It’s the first Sunday after the first full moon after the spring equinox. That can be a complex calculation to make. In 2011, the full moon in March was the 19th. About 36 hours before the spring equinox. 29.5 days later will be the next full moon – April 18th. It happens to be a Monday, which means that Easter is six days later on April 24th, 2011. I wonder what the latest possible Easter Sunday is?