Feast rankings pre-VII

[gracepoole]

I located this online but it just makes no sense to me. Is there anyone who can translate this for someone who’s admittedly uninformed about pre-Vatican II feast rankings?

d1cl - double of first class
d2cl - double of second class
dm - double major feast
d - double feast
sd - semi-double feast
sp - simple feast
v - vigil
f - ferial day; no feast appointed

What, for example, is a “double of first class”? Why not just call it first class? What does the “double” mean? What about “double major”? How is that different from a straight-up double? Help?

 

[Fauken]

https://www.fisheaters.com/time.html

There’s a table that kind of translates the pre-1962 names you have listed to 1962 names, if that helps.

 

[Vico]

I located this online but it just makes no sense to me.
…

Double (duplex) is an old term which is now obscure but likely meant that two sets of Matins were to be used - the one of the feria or week-day, the other of the festival.

Duplex:

• Higher rank: duplicia secundae classis and the duplicia primae classis
• Minor rank: duplicia minora

 

[Tis_Bearself]

Wikipedia is informative on this topic:

Ranking of liturgical days in the Roman Rite - Wikipedia