I just mentally went over the 3 cemetarys I know, and amazingly, it seems to me that the gravestones face east.
What a great bar bet. ( like in, "I'll give you $1 for each grave stone facing either south, west, or north, you give me 25 cents for each gravestone facing east")
The head faces east to meet the rising sun in most of our OLD cemteries. Spent years doing cemetery restoration.