From a reader:
What should one do when one is travelling on an HDO? Should one follow the rule for the diocese one is actually in, or the one where one resides? What if one is on the plane during the day? How does one know which rule to follow? My husband and I have actually had this dilemma and didn’t have a clue what to do.
HDO…. HDO… I assume this means Heavy Derrick Operator.
If you are traveling on a Heavy Derrick Operator, then please get off now. I don’t think that either he or your husband will approve of this odd way of traveling, and you may be getting into all sorts of problems with unions and overtime.
St. Augustine recounts an episode about his mother, St. Monnica, when she was with him in Milan. Monnica carried on with her North African custom of refrigeria meals (called laetitia in Confessions 6.2.2) in cemeteries by the tombs of the dead. This raised many Milanese eyebrows, including those of bishop Ambrose.
Augustine says that Ambrose instructed Monnica not to do this in Milan, for it was not their local custom. Ambrose said that when he was in Rome, he followed the Roman laws concerning fasting, which were different from those of Milan: “When I am here I do not fast on Saturday, but when I am at Rome I do; whatever Church you may come to, conform to its custom” (cf. Augustine ep 36.14.32 and ep 54.2.3).
In other words, when in Rome you do as the Romans do.
We follow the local rules of the place where we are, according to our Church. Latin Church members follow Latin Church rules of the local Latin diocese even if they go to a Ukrainian Catholic Church for Divine Liturgy that day.
And, yes, this applies to HDO.
I also applies to Holy Days of Obligation.
But, make sure to check if Thursday, Ascension THURSDAY, has been transferred to Ascension Thursday Sunday in the place you actually observe it.