[oldenuff2no]

The sun has something to do with it but the weather is what usually causes this alignment. Storms come in from the south and a cow well put her behind into the weather. North winds are cold and dry but a cow will still turn her head away from that weather change too.
I was born and raised on a big ranch and every cowboy worth his salt knows all about what a heard of cattle will look like in a storm.
Who ever dreamed up this post doesn't know the north end of a cow from the south end.

[Smokin' Joe]

Yep. Wind direction dependent more than anything, and it depends on which direction the storms come from. The writer needs to get out in the boonies more often...

[Kirkwood]

You are 100% correct.

[Daffynition]

Proof!