You Learn Something New Every Day

I have the privilege of attending Solemn High Masses in the pre-1955 rites every day of Holy Week.

So, being the curious man I am (curious as in inquisitive amid the world around me and not odd), I did a little research.

You’re welcome in advance.

https://www.newliturgicalmovement.org/2009/03/use-history-and-development-of-planeta.html?m=1