1088 divided by (1088 x 6.25 or 25/4 is the nodal cycle of the moon)
346.666r (eclipse danger periods occur every 173.333r days)
the diameters this unit works with are in units of base 13 so 520 is the key unit
520 x Thom Pi above is 1632 or 1/2 a megalithic yard in inches
The diameter of the circle Avebury is designed against is 520 units.