In America, most of us celebrate a new year on January 1, according to the Gregorian calendar. But some parts of the world have different traditions.
This year Easter will be celebrated on March 31, but in 2014 it will occur on April 20. The reason has to do with the mismatch between the periodicity of the sun and the moon and the long history of human efforts to create a reliable and consistent calendar.
A centuries-old worldview is always ready to condemn change as being against the will of God. What I came to understand is that this worldview has its reasons for being.