[supercat]

Canon 921 refers to Viaticum. It is possible that you go to two masses in one day, then are in a situation to receive Viaticum, and that is allowed. It's the only way you can receive the Eucharist 3 times in one 24 hour period!

How is the term "day" defined, for such purposes? Local midnight to local midnight, typical sleep/wake cycle [excluding all-nighters and naps], or what? I would think the latter definition would be the most logical, excluding deliberate abuse.

[Knitting A Conundrum]

According to Jimmy Akins, who is a great one for good solid answers, and from whom I lifted this info, it refers to a 24 hour period.

He talks about it in great detail on this page:

http://www.jimmyakin.org/2005/02/how_many_times_.html