<<<Rogation Days, like their distant cousins the Ember Days, are days set aside to observe a change in the seasons. Rogation Days are tied to the spring planting. There are four Rogation Days: the Major Rogation, which falls on April 25, and three Minor Rogations, which are held on the Monday, Tuesday, and Wednesday immediately before Ascension Thursday.
As the Catholic Encyclopedia notes, Rogation Days are "Days of prayer, and fasting, instituted by the Church to appease God's anger at man's transgressions, to ask protection in calamities, and to obtain a good and bountiful harvest.>>>