*Plan of Avebury showing the stone arrangement of the henge. Source: The Avebury Cycle Michael Dames (1977).*

The principle of finding anniversaries appears promising when three solar years contain just over 37 (37.1) lunar months while three lunar years contain 36 lunar months and, if one then looks for a better anniversary, then one can move to the 8 year period which has two key features.

- The sun will appear on the horizon where it did 8 solar years ago because of the quarter day every solar year.
- The moon will be in the same phase (relative to the sun) after 99 lunar months.

This appears useful: by dividing the days in eight years (~ 2922 days) by 99 (having counted to 99 months by eight years) the resulting estimate for the lunar month is 29.514 days, out by just 23 minutes of our time.

Eight solar years was therefore an early calendar in which the solar year could be somewhat integrated by the lunar year. However, the lunar year was entrenched as a sacred calendar, for example in Archaic Greece. And it may be that when the Neolithic reached England in the Bronze Age that 99 stones were placed around the massive henge of Avebury so that eight solar years could be tracked in a seasonal calendar alongside 99 lunar months, 96 months constituting eight lunar years.

The three lunar months left over must then, divided by 8, give the solar excess over the lunar year as 3/8 = 0.375, whereas the actual excess is 0.368 lunar months or 5 hours less. In the previous post, two months the stone age could have been counted as 59 days, here 8 solar years could have been counted as 99 lunar months at Avebury. Through this, one would be homing in on knowing the solar excess per year (10.875 days) and the length of the lunar month, to more accuracy.

It is obvious that counting using whole months has not got enough resolution to catch an accurate result and so in the next post we must revert to counting days in inches, as was done at Le Manio around 4000 BC, over the 36/37 month anniversary at three solar years. It is important to grasp that while we have great functional mathematics, we are here using it to find out what the numeracy 3000-4000 BC could have intended or achieved within counts *monumentalized *geometrically as a stone monument that can store information.