Holy Week XII. In this Mass, the bishop blesses separate oils for the sick (used in Anointing of the Sick), for catechumens (used in Baptism) and chrism (used in Baptism, but especially in Confirmation and Holy Orders, as well as in rites such as the dedication of an altar and a church). Tenebrae (Latin for "shadows" or "darkness") is celebrated within Western Christianity on the evening before or early morning of Maundy Thursday, Good Friday, and Holy Saturday. Tenebrae is distinctive for its gradual extinguishing of candles while a series of readings and psalms is chanted or recited. Tenebrae services are celebrated
Determination of the day of the week G. Leap years have two Sunday Letters, so for January and February calculate the day of the week for 1 January and for March to December calculate the day of the week for 1 October. Leap years are all years which divide exactly by four with the following exceptions: In the Gregorian calendar – all years which divide exactly by 100 (other than those which divide exactly by 400). In the Revised Julian calendar – all years which divide exactly by 100 (other than those which give remainder 200 or 600 when divided by 900). Use this table for finding