The seven rhythms of SYNC correlate to an annual cycle of Christian and Jewish holidays. In this cycle, the story starts on January 1st with the creation of the world and ends on December 31st looking forward to Christ's return. In between, some holidays like Easter have their familiar meanings and some like Ash Wednesday are given new meanings.
The tab above marked "Guide" is for one of the rhythms in the cycle. That tab changes each time a SYNC rhythm changes on a certain holiday. The Bible reading lists follow this cycle, and the "annual cycle" option for using the Jubilee Cards also follows it.
To use the cards in SYNC with this cycle instead of the 50-day cycle printed on the cards, choose the seven cards that fit each rhythm. Go through those cards, one per day, as many times as fit into the season length described in the list above.
For example, the season for the Life Rhythm is 64 days long. You go through the set of seven Life cards nine times (9 x 7 = 63) and you use the first card again on the 64th day.