It read Sexuagesima Sunday II. That should be Sexagesima.
The Latin word for six is sex, and 60 is sexaginta.
Sexagesimal, also known as base 60 or sexagenary, is a numeral system with sixty as its base. It originated with the ancient Sumerians in the 3rd millennium BC, was passed down to the ancient Babylonians, and is still used—in a modified form—for measuring time, angles, and geographic coordinates.