Responsories for Holy Week of the Lord", referring to the Last Supper). Thus the first nine responsories for Holy Week can appear under titles such as "Feria V – In Coena Domini". When the naming is according to the preceding day, names like "Les neuf répons du mercredi saint" (The nine responsories of Holy Wednesday) can occur (Charpentier). The lessons of the first nocturn of Maundy Thursday are from Lamentations 1:1-14 (1:1–5, 1:6–9 and 1:10–14 respectively). The first responsory for Maundy Thursday sets the scene at Mount Olivet (in monte Oliveti), the episode referred to as the Agony of Christ at Gethsemane. The text
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