Holy Week violet covers during Passiontide, but the crucifix covers can be white instead of violet on Maundy Thursday). Some Protestant churches practice the foot washing (Maundy) ceremony on Maundy Thursday. For others, it may be the only time in the year when Holy Communion is celebrated. Good Friday commemorates the crucifixion of Jesus and his subsequent death. Commemorations of often solemn and mournful, many denominations use Good Friday to perform the Stations of the Cross, or other commemorations of the Passion, either as a self-guided time of reflection and veneration or as a procession of statues or images of the stations.
Determination of the day of the week week is where the positive modulus is chosen. The value of is obtained from the following table: The value of is obtained from the following table, which depends on the calendar. For the Gregorian calendar, For the Julian calendar, Charles Lutwidge Dodgson (Lewis Carroll) devised a method resembling a puzzle, yet partly tabular in using the same index numbers for the months as in the "Complete table: Julian and Gregorian calendars" above. He lists the same three adjustments for the first three months of non-leap years, one 7 higher for the last, and gives cryptic instructions for finding the rest;