Every five years, just after New Year, I think, “When’s Epiphany?” and then, “Rosca de Reyes!” and then, “Is it Mexican or Spanish?” and then “Which book does it come from?”. Just look at this post from January 2017. The situation is exactly the same this year. I write out the formula OK and think I’ll remember the detail. Some hopes.
Anyway, this being the third fifth year, I went through the whole process yet again and wrote the whole thing up.
So, just for you (and maybe for me the way the memory’s going) here’s the formula plus the method for assembling the whole thing – Rosca de Reyes