It’s pretty steep and the “steps” are about 6” wide and 20” high - I was in great shape and my legs were pretty tired by the time I got back to the bottom. Had to do “sidesteps”, especially on the way down to keep from taking a nose dive.
The overall angle of rise on this pyramid is less than 45 degrees. It has multiple levels, with a flat and wider base at the beginning of each new level. Thus the overall slope is less than 45 degrees while the slope of each subsection may be about 45 degrees. If you ask AI the question, they will give photos of various views of that pyramid. I don’t know how to copy and move to this comment. I climbed this in 1957 or 1958, so it looks somewhat different than it did then.
I then asked photos for Chichen Itza pyramid and pyramids in Guatemala. Tikal is the really steep one I remember seeing before. The level areas that separate each segment of the Pyramid of the Moon make it feel much safer to climb. There were some scary photos of people climbing at Chichen Itza.