all goes back to osiris-baal-moloch, which goes back to ancient astrology.
"the goat of Mendes", the "age of the ram".
the reason moses was represented with horns is a mistranslation of the hebrew text, mistaking "rays (of sun) over him" with "hornes on him".
The hebrew word "KEREN" means both a horn and a ray.
As a side note, it is possible that the writer of the hebrew bible wrote this with a double meaning.