The Calendar

The Stonehenge calendar. From the centre, the central bluestone horseshoe is surrounded by the giant trilithon ellipse, enclosed in turn by a bluestone ring and outside this is the ring of giant sarsens. The key to the calendrical measurements lies in the various posthole rings, of which the Aubrey circle of 56 postholes with its station rectangle is most significant. Its 56 postholes likely define the 28 days in every calendar month (12 hours between each posthole)

1 Aubrey Holes The 56 Aubrey holes - at 19 megalithic yards radius from the centre - form the calendar month (one stone for every 12 hours). 4 stones form a rectangle of Station Stones, which form the key axis of all key calendrical and astronomical observation 2 Consonants The 13 consonants represent the 13 months of the year. Beginning with Beithe that lies at 6 oclock and contains the midwinter solstice the calendar progresses clockwise (midsummer solstice lies at 12 oclock). The relationship of 12 to 13 months (solar to lunar) is apparent through the geometry of the 'pythagorean triangle' on the 4 Station Stones 3 Vowels The 5 vowels define not time periods but points - the solstices and equinoxes. They also likely articulate five sequences of 11 holes each that make up the 19 year lunar calendar (the Metonic cycle of 18.62 years or 235 lunations). 4 Horseshoe The inner 19 Bluestones surrounded by the 5 Trilithon dolmens make up the core horseshoe, reflecting the 19 year cycle and the five-point vowels. In Ogham, the five fingers of the hand are fundamental to the language's mnemotic uses and five solar years are demonstrated in the celtic Coligny calendar.

Below is tricky to reproduce at this small scale, but...