B
babochka
Guest
This is an old discipline, which is no longer in effect.You can’t miss Mass on Sunday, nor should one go to a non-Catholic service unless there’s a serious reason (e.g. family funeral).
The original post-Vatican II Ecumenical directory said this:
N. 50 Catholics may be allowed to attend Orthodox liturgical services if they have reasonable grounds, e.e. arising out of public office or function, blood relationships, friendships, desire to be better informed, etc. In such cased there is nothing against their taking part in the common responses, hymns, and actions of the Church in which they are guests. Receiving Holy Communion, however, will be governed by what is laid down above , nr 42 and 44.
N. 47 A Catholic who occasionally, for reasons set out below, attends the Holy Liturgy (Mass) on a Sunday or holy day of obligation in an Orthodox Church is not then bound to assist at Mass in a Catholic Church, It is likewise a good thing if on such days Catholics who for just reasons cannot go to Mass in their won Church, attend the Holy Liturgy of their separated Oriental brethren, if this is possible.
The directory was updated in 1993 and no longer allows Catholics to fulfill their Sunday obligation in an Orthodox Church, but the justifiable reasons for attending an Orthodox liturgy remain the same.