Words
In case order matters, I've numbered the words etched into the sarsen stones below, starting with ONE and working clockwise as indicated by the alien creature.
1. ONE 11. OTHER 21. RED
2. ZONE 12. RAIN 22. END
3. LORE 13. OUTER 23. OTHER
4. END 14. INNER 24. AUNT
5. RIDGE 15. LOWER 25. EARTH
6. PEN 16. HAT 26. ICE
7. UPPER 17. PINE 27. OWL
8. RAIN 18. ODD 28. HORN
9. END 19. HOUSE 29. EVEN
10. END 20. OLD 30. END
Stats
Words that occur multiple times:
END
: 5 times {4, 9, 10, 22, 30}
RAIN
: 2 times {8, 12}
OTHER
: 2 times {11, 23}
Several of the words pair off into opposites:
{7, 15}
is UPPER/LOWER
{13, 14}
is OUTER/INNER
{18, 29}
is ODD/EVEN
Numbers
If we address the numbered stones as they appear, from lintel to matching horseshoe stone below, we get:
4 8 2 26 20 9 29
--- --- --- --- --- --- ---
+12 -14 +4 +15 -8 +14 +8
+12 +11 -7 -15
-8 -8
Now, if we are meant to add the numbers as they appear, we get:
28 -6 17 41 -3 23 14
That really doesn't seem to get us anything meaningful.
Numbers -> Words
Notice how the numbers on the stones are all 30 or below? If we instead use the numbers to represent words, we get:
END RAIN ZONE ICE OLD END EVEN
--- --- --- --- --- --- ---
+RAIN -INNER +END +LOWER -RAIN +INNER +RAIN
+RAIN +OTHER -UPPER -LOWER
-RAIN -RAIN
This seems like it might yield something more interesting. I see a couple of recognizable phrases right away: END + RAIN + RAIN
could refer to the nursery rhyme "Rain, rain, go away. Come again another day." ZONE + END + OTHER
may refer to an endzone (American football) and the Twilight Zone.
Alternately, we could treat the horseshoe stones as denoting letters instead of words.
END RAIN ZONE ICE OLD END EVEN
--- --- --- --- --- --- ---
+L -N +D +O -H +N +H
+L +K -G -O
-H -H
Make of it what you will. I don't really make much of anything.
Words, but also numbers
Or we could start at the lintel and move around the circle according to the numbers.
Lintel #1
4. END 8. RAIN
------------- -------------
+12 = 16. HAT -14 = 24. AUNT
+12 = 28. HORN
Lintel #2
2. ZONE
-------------
+4 = 6. PEN
+11 = 17. PINE
Lintel #3
26. ICE
-------------
+15 = 11. OTHER
Lintel #4
20. OLD 9. END
------------- -------------
-8 = 12. RAIN +14 = 23. OTHER
-7 = 5. RIDGE
-8 = 27. OWL
Lintel #5
29. EVEN
-------------
+8 = 7. UPPER
+15 = 22. END
-8 = 14. INNER
*shrug*
This turns out to be the right path, but only reveals half the answer, so working from here, I can see that none of the stones repeat. Taking the leftover numbers, we are left with:
{1, 3, 10, 13, 15, 18, 19, 21, 25, 30}
which correspond to ONE LORE END OUTER LOWER ODD HOUSE RED EARTH END
Notes
The alien creatures have 3 eyestalks and 4 arms. It's not that likely, but it's worth mentioning that these could also refer to actual English terms -- "third eye" and "forearm".
In the image below, I've noted the approximate center lines (in teal), drawn lines from the center through each of the standing candlesticks (in green), and connected each of the "END" stones in a pentagon (in magenta). It's worth noting that the shape created by the candlesticks plus the uppermost center line which runs through the candlestick laying down is approximately symmetrical. It could be meant to indicate an arrow pointing at the starting stone ONE
, in case we hadn't already figured that out.