This slab, and the walls around it, are part of a great calendar which told the priests when to sacrifice what. Every day of the year was written down, there, which tells archaeologists a lot about the religion of later days.

The original temple was built by Amenophis I and Thutmosis III, and was rebuilt by the Ptolemies more than 1000 years later. So what we're seeing here may be the original forms of worship, or they might be the "modern" take on what folks used to do. Hard to say.