That's "kind of East", and that has to do with optimizing light, and heat.
I don't recall a specific Christian tradition regarding the orientation of gravestones ~ after all, Jesus can arrive over any part of the horizon He wishes. He is not bound by the Sun.
The Son is not bound by the Sun?
"I don't recall a specific Christian tradition regarding the orientation of gravestone....." ,p.Yes, there is one, and it is just as this article states. Our pastor was talking about this about two Sundays ago in Bible class.
Go look at some cemetaries sometimes. All I have ever been in you are lying on your back feet to the east. Waiting the coming of Christ. Everyone. I will be planted facing EAST not Mecca.