If you know where in a particular graveyard the headsone is, your old friend, Google Earth, can be useful. Remember that the sun rises in the East and sets in the West and you might be able to work out what time of day is best to visit. An angled sun will help the inscription to stand out (if that’s not too much of an oxymoron!). What you don’t want is to be photographing a South facing headstone at mid-day.