vatican.va/roman_curia/congregations/ccdds/documents/rc_con_ccdds_doc_20030317_ordinamento-messale_en.html
- Each diocese should have its own Calendar and Proper of Masses. For its part, the Bishops’ Conference should draw up a proper calendar for the nation or, together with other Conferences, a calendar for a wider territory, to be approved by the Apostolic See.[153]
In carrying this out, to the greatest extent possible the Lord’s Day is to be preserved and safeguarded, as the primordial holy day, and hence other celebrations, unless they be truly of the greatest importance, should not have precedence over it.[154] Care should likewise be taken that the liturgical year as revised by decree of the Second Vatican Council not be obscured by secondary elements.
In the drawing up of the calendar of a nation, the Rogation and Ember Days should be indicated (cf. no. 373), as well as the forms and texts for their celebration,[155] and other special measures should also be taken into consideration.
It is appropriate that in publishing the Missal, celebrations proper to an entire nation or territory be inserted at the correct place among the celebrations of the General Calendar, while those proper to a region or diocese be placed in a special appendix.
familyfeastandferia.wordpress.com/living-the-liturgical-year-at-home/ember-and-rogation-days/
Rogation and Ember Days
45. On rogation and ember days the practice of the Church is to offer prayers to the Lord for the needs of all people, especially for the productivity of the earth and for human labor, and to give him public thanks.
- In order to adapt the rogation and ember days to various regions and the different needs of the people, the conferences of bishops should arrange the time and plan for their celebration.
Consequently, the competent authority should lay down norms, in view of local conditions, on extending such celebrations over one or several days and on repeating them during the year.
- On each day of these celebrations the Mass should be one of the votive Masses for various needs and occassions that is best suited for the intentions of the petitioners.
There is a different focus on each day of ember week:
Ember Wednesdays are dedicated to Mary; they are always “Mary’s Day”. All four ember Wednesdays were celebrated in the station church St. Mary Major. Wednesday, devoted to our Lady, is a day of reflection and spiritual orientation.
All four Ember Fridays take place in the stational church of the Basilica of the Apostles. I like how Father Parsch puts it: “Ember Friday is the liturgy’s ‘Yom Kippur.’” Friday emphasizes conversion and penance.
All the Ember Saturdays take place in the stational church of St. Peter. Saturday is a preview of Easter, and it marks the renewal of our baptismal covenant.
newadvent.org/cathen/01067a.htm
Ember Days
The beginning of the four seasons of the year is marked by Ember Week,
during which Wednesday, Friday, and Saturday are days of fasting and abstinence. Ember Week occurs after the first Sunday of Lent, after Pentecost, after the feast of the Exaltation of the Holy Cross, and after the third Sunday in Advent. According to some writers the Ember Days in December were introduced by the Apostles as a preparation for the ordinations which occurred during that month (Layman, loc. cit.). The scriptural basis for this practice is to be found in Acts 13:2 sq. The summer Ember Days were observed during the octave of Pentecost (St. Leo I, Sermo ii, de Pentecost.), and the autumn Ember Days in September (Idem, Sermo viii, De jejunio septimi mensis). In the False Decretals (c. 840-50) Pope Callistus (217-22) is made to add a fourth week. We decree, he says, that the fast which you have learned to keep three times yearly, shall henceforward be made four times a year (Epist., Decr. lxxvi, cap., i; Migne, P.G., X, 121). St. Jerome, in his commentary on the eighth chapter of Zachary, believes that the Ember Days were instituted after the example of the Jews, who fasted and abstained four times during the year, as noted in the preceding paragraph. St. Leo I (Sermo vii, De jej. sept. mensis) considers that the purpose of penance during Ember Week is to urge the faithful to special efforts in the cause of continency. The two views are entirely compatible.
I don’t know where you got “half-abstinence” from.
