The undulating band (like a snake) is reaching its turning point at solstice (where there is only one month: June):

And here we find somebody blowing the trumpet saying stop, stop, stop. Surely he has also a victims head, the 'nut', dangling in his left (of course) hand to make the sun god stop and return to fetch it. The same picture (though mirrored) is located at summer solstice - a 'nut' is needed there to. But perhaps the 'nut' is just the full moon.