Holy Week lamp or candle usually situated next to the tabernacle denoting the Presence of Christ is put out, and the remaining Eucharistic Hosts consecrated on Holy Thursday are kept elsewhere, usually the sacristy, with a lamp or candle burning before it, so that, in cases of the danger of death, they may be given as "viaticum". The name of the Easter Vigil, even if the vigil is held on what on the civil calendar is still Saturday, indicates that liturgically it is already Easter, no longer part of Holy Week, but still part of the Easter Triduum. In the Anglican, Catholic,
Determination of the day of the week the intended design objective. The tabular forerunner to Tøndering's algorithm is embodied in the following K&R C function. With minor changes, it was adapted for other high level programming languages such as APL2. Posted by Tomohiko Sakamoto on the comp.lang.c Usenet newsgroup in 1992, it is accurate for any Gregorian date. IBM's Rata Die method requires that one knows the "key day" of the proleptic Gregorian calendar i.e. the day of the week of January 1, AD 1 (its first date). This has to be done to establish the remainder number based on which the day of the week is