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I have been another Dartmoor guide a bit longer than Roger.
Hurston Ridge row is generally accepted to be the least altered on the moor. Others have been extensively re-erected and it is not certain that now they are exactly as constructed.
However if you stand at the lower terminal of this row and look uphill to the remains of the cairn it is silouetted on the horizon.
A site survey with admittedly hand held instruments reveals that the lunar declination for the cairn has a value of -29.7 indicating most southerly moonset on the 18.6 year lunar cycle. The moon would have set into the cairn.
This is not proof of anything of course but it is interesting.
There are several other rows on the moor that seem to mark the extreme lunar positions in this way.
I really think that this idea is worth a bit more research than the idea that the row is a linear map that shows the route to Bronze Age Minhead.
I did not fiddle any figures to get the result. As accurately as I can the details are true azimuth 205, horizon altitude 5, latitude 50 37.
Something is not right. This message is just to keep things from messing up down the road