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DaveP et al,

Bronze-Age forts often have altars or tombs aligned with the winter solstice sunrise. The start of the Sun's return north marks the beginning of a new year cycle and is a cause for celebration. This is the case here. The Sun would have risen on a bearing of about 129°. Sin Amp=SinDec/Cos Lat. Further confirmation of Lat.

My shot at noon on the day of the solstice was taken by holding my iPhone in the right hand, little finger hard against the upper top right window, and left hand used to press the button on the iPhone screen. Not, as might be thought, by holding a camera up to the eye. The lens was in a position never obtainable by the human eye, and can see  the footstep which protrudes outwards from the lower longeron.

3 points:

a.   The Cub was temporarily not being steered, and the revs were dropping. 

b.    Excavations in those forts show altars, and that there was possibly a cult, that celebrated a new year by eating boar. Eating turkey is a recent practice.
c.    Aligning with that altar using my Cub compass in an iron-age fort would have needed knowledge of local magnetic variation anomaly.

Poorer people in the British Isles who could  not afford the best cuts of boar, were left with the head, which was stuffed. As it happens, my local pub is The Boar's Head.

Brian Walton