The Origins of the Sun

In many Indo-European cultures this tradition of a horse sacrifice, which in which the horse represents the sun and it also relates both to the fertility of the land. So Yule originally was centered around the sacrifice and eating of a horse. It makes me think if Apollo is associated with the sun and Apollo's chariot, Apollo is a horse drawn chariot, it was supposed to draw the sun across the sky in some traditions. Of course, there's Apollo, but there's like the deity soul or soul in victus or even myth-ra isn't myth reconnected to the sun? There's a lot there, isn't there, in the worship of the sun, a lot