As a Catholic, I was always taught that Jesus died on Friday and rose to heaven on Sunday. I know this is argued in theological circles unendingly, but there were three days between Jesus' death and when eh ascended into heaven, as is part of the liturgy, "on the third day he rose again". I guess this isn't a question, but I was surprised to read in your essay that he died and ascended on Sunday. Is that a French thing?
Learn about the mobile jour férié and Christian holiday of Ascension, celebrated 40 days after Easter Sunday.